-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:±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=524288 The size of an aligned chunk. Serial and epsilon GC only.
-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. Serial and epsilon GC only.
-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:±AllowDeprecatedAutomaticFeature Allow using deprecated @AutomaticFeature annotation. If set to false, an error is shown instead of a warning. Default: +
(enabled).
-H:±AllowDeprecatedBuilderClassesOnImageClasspath
Instead of abort, only warn if image builder classes are found on the image class-path. Default: - (disabled).
-H:±AllowDeprecatedInitializeAllClassesAtBuildTime
Instead of abort, only warn if --initialize-at-build-time= is used. 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 run time. 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: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:±BitcodeOptimizations Enable LLVM bitcode optimizations. Default: - (disabled).
-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 (enabled by default if colors are supported by terminal). Default: - (disabled).
-H:±BuildOutputGCWarnings Print GC warnings as part of build output. Default: + (enabled).
-H:BuildOutputJSONFile=<path>* Print build output statistics as JSON to the specified file. The output conforms to the JSON schema located at:
docs/reference-manual/native-image/assets/build-output-schema-v0.9.2.json.
-H:±BuildOutputLinks Show links in build output (defaults to the value of BuildOutputColorful). Default: - (disabled).
-H:±BuildOutputPrefix Prefix build output with '<pid>:<image name>'. Default: - (disabled).
-H:±BuildOutputProgress Report progress in build output (default is adaptive). Default: - (disabled).
-H:±BuildOutputRecommendations Show recommendations as part of the build output. Default: + (enabled).
-H:±BuildOutputSilent Silence build output. Default: - (disabled).
-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=<path>* 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. These features are in addition to -march.
-H:CStandard="C89" C standard to use in header files. Possible values are 'C89', 'C99', and 'C11'.
-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:CheckBootModuleDependencies=1 Temporary option to disable checking of image builder module dependencies or increasing its verbosity.
-H:±CheckIsolateThreadAtEntry At CEntryPoints check that the passed IsolateThread is valid. Default: - (disabled).
-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=300.0 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:CompilationWatchDogStartDelay=0 Delay in seconds before watch dog monitors a compilation (0 disables monitoring).
-H:CompilationWatchDogVMExitDelay=0 Number of seconds after which a compilation appearing to make no progress causes the VM to exit (0 disables VM exiting).
-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:±ConditionalEliminationBeforeAnalysis Run conditional elimination before static analysis. Default: + (enabled).
-H:ConditionalEliminationMaxIterations=4
-H:ConfigurationFileDirectories=<path>* 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:ContendedPaddingWidth=128 How many bytes to pad fields and classes marked @Contended with.
-H:±CopyLanguageResources Automatically copy the necessary language resources to the resources/languages directory next to the produced
image.Language resources for each language are specified in the native-image-resources.filelist file located in the
language home directory.If there is no native-image-resources.filelist file in the language home directory or the file
is empty, then no resources are copied. 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. Serial GC only. 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:±CreateJvmShim Create a `jvm` shim for native libraries that link against that library. Default: - (disabled).
-H:CustomLD="" Path to a custom ld binary for LLVM linking.
-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:DebugCodeInfoMaxDepth=2147483647 Specify maximum inlining depth to consider when building DebugCodeInfo.
-H:±DebugCodeInfoUseSourceMappings Do not use SourceMappings for generating DebugCodeInfo (i.e. only use Infopoints). Default: - (disabled).
-H:DebugInfoSourceCacheRoot="sources" Directory under which to create source file cache for Application or GraalVM classes.
-H:DebugInfoSourceSearchPath=<path>* 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-AU" Default locale of the image, by the default it is the same as the default locale of the image builder.
-H:DefaultLoopFrequency=100.0 Default frequency for loops with unknown local frequency.
-H:DefaultUnswitchFactor=0.7 Default unswitching factor for control split node with unkown profile data.
-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:DiagnosticBufferSize=30 Specifies the number of entries that diagnostic buffers have.
-H:DiagnosticsDir=<path>* Sets the dir where diagnostic information is dumped.
-H:±DiagnosticsMode Enables the diagnostic mode. Default: - (disabled).
-H:±DisableABCE Disable array bounds check elimations. Default: + (enabled).
-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: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:±DumpFoldedReflectionElements Dump folded reflection elements. 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:DumpLLVMStackMap=... Dump contents of the generated stackmap to the specified file. Default: None
-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:±DumpRuntimeCompilationOnSignal Dumps all runtime compiled methods on SIGUSR2. Default: - (disabled).
-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=<path>* 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: + (enabled).
-H:±EarlyLICM Perform early loop invariant code motion. Default: + (enabled).
-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:EnableMonitoringFeatures=<string>* Enable monitoring features that allow the VM to be inspected at run time. Comma-separated list can contain 'heapdump',
'jfr', 'jvmstat', 'jmxserver' (experimental), 'jmxclient' (experimental), or 'all' (deprecated behavior: defaults to
'all' if no argument is provided). For example: '--enable-monitoring=heapdump,jfr'.
-H:±EnableSecurityServicesFeature Enable automatic registration of security services. Default: + (enabled).
-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:ErrorFile="svm_err_b_%t_pid%p.md" If an error occurs, save a build error report to this file [default: svm_err_b_%t_pid%p.md] (%p replaced with pid, %t
with timestamp).).
-H:±EscapeAnalysisBeforeAnalysis Run partial escape analysis on compiler graphs before static analysis. Default: + (enabled).
-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:ExpectedEdenSize=33554432 Soft upper limit for used eden size. The hinted GC will be performed if the used eden size exceeds this value.
-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:±ForceExplicitReachabilityFence Force an explicit compiler node for Reference.reachabilityFence, instead of relying on FrameState liveness. Default: -
(disabled).
-H:±ForceNoROSectionRelocations Use only a writable native image heap (requires ld.gold linker). Default: - (disabled).
-H:±FullUnroll Default: + (enabled).
-H:FullUnrollCodeSizeBudgetFactorForLargeGraphs=2.0
Maximum factor by which full unrolling can increase code size for large graphs. The FullUnrollSmallGraphThreshold option
determines which graphs are small.
-H:FullUnrollCodeSizeBudgetFactorForSmallGraphs=10.0
Maximum factor by which full unrolling can increase code size for small graphs. The FullUnrollSmallGraphThreshold option
determines which graphs are small.
-H:FullUnrollConstantCompareBoost=15
-H:FullUnrollMaxApplication=60
-H:FullUnrollMaxIterations=600
-H:FullUnrollMaxNodes=400
-H:FullUnrollSmallGraphThreshold=1000 The threshold in terms of NodeSize for a graph to be considered small for the purpose of full unrolling. Applied in
conjunction with the FullUnrollCodeSizeBudgetFactorForSmallGraphs and FullUnrollCodeSizeBudgetFactorForLargeGraphs
options.
-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:±GenerateBuildArtifactsFile Create a build-artifacts.json file in the build directory. The output conforms to the JSON schema located at:
docs/reference-manual/native-image/assets/build-artifacts-schema-v0.9.0.json. Default: - (disabled).
-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. Serial GC only. Default: - (disabled).
-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. Serial and epsilon GC only.
-H:HeapVerifierVerbosity=0 Control heap verifier verbosity level: 0 - quiet, 1 - info, 2 - warning, 3 - all.
-H:HotCodeMinSelfTime=0.001 Minimal self time for a compilation unit to be considered hot globally.
-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:±ImageHeapCardMarking Enables card marking for image heap objects, which arranges them in chunks. Automatically enabled when supported. Serial
GC only.
-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:IncludeLLVMDebugInfo=0 Include debugging info in the generated image (for LLVM backend).
-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. Serial GC only.
-H:InjectedCompilationDelay=0 The number of seconds by which to slow down each compilation. The compilations slowed down can be restricted with
MethodFilter. This option exists to test the compilation watchdog.
-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:±InlineGraalStubs Embed all the emitted code for Graal-generated stubs. 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=<path>* 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:LIRInstructionVerifierPath=... Path to jar file containing LIR instruction verifier. Default: None
-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:LLVMDataSectionBatchSizeFactor=10 Factor used to multiply the page size of the machine to obtain the data section batch size.
-H:LLVMMaxFunctionsPerBatch=1000 Maximum size of batches used for LLVM compilation. 0 means a single batch, 1 means all functions separately.
-H:±LSRAOptSplitOnly LSRA optimization: Only split but do not reassign. Default: - (disabled).
-H:±LSRAOptimization Enable LSRA optimization. Default: - (disabled).
-H:LargeArrayThreshold=131072 The size at or above which an array will be allocated in its own unaligned chunk. Serial and epsilon GC only.
-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:±ListModules List observable modules and exit. 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:LoadProfiles=... Load per compilation profile information. Default: None
-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=20.0 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=20 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=0 The maximum number of constant objects recorded for each type before merging the constants into one unique constant
object per type. If the value is 0 there is no limit.
-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:MaxNodesAfterTrivialInlining=2147483647 The maximum number of nodes in a graph allowed after trivial inlining.
-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. Serial GC only. 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:MaxUnswitchSuccessors=64 Maximum number of split successors before aborting unswitching.
-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:MicroArchitecture=... Generate instructions for a specific machine type. Defaults to 'x86-64-v3' on AMD64 and 'armv8-a' on AArch64. Use
-march=compatibility for best compatibility, or -march=native for best performance if the native executable is deployed
on the same machine or on a machine with the same CPU features. To list all available machine types, use -march=list.
Default: None
-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:MissingRegistrationReportingMode=Throw Select the mode in which the missing reflection registrations will be reported. [Extra help available]
-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 Uses the native architecture, i.e., the architecture of a machine that builds an image. 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: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: - (disabled).
-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:OptimizationLog=... Enable the structured optimization log and specify where it is printed. Default: None [Extra help available]
-H:OptimizationLogPath=... Path to the directory where the optimization log is saved if OptimizationLog is set to Directory. Directories are
created if they do no exist. Default: None
-H:Optimize="2" Control code optimizations: b - optimize for fastest build time, 0 - no optimizations, 1 - basic optimizations, 2 -
advanced optimizations, 3 - all optimizations for best performance.
-H:±OptimizeReturnedParameter Analysis: Detect methods that return one of their parameters and hardwire the parameter straight to the return. Default:
+ (enabled).
-H:±OverrideProfiles Allow multiple compilations of the same method by overriding existing profiles. Default: - (disabled).
-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:±ParseOnceJIT When true, each compiler graph version (DeoptTarget, AOT, JIT) needed for runtime compilation will be separately
analyzed during static analysis.When false, only one version of the compiler graph (AOT) will be used in static
analysis, and then three new versions will be parsed for compilation. Default: - (disabled).
-H:±ParseRuntimeOptions Parse and consume standard options and system properties from the command line arguments when the VM is created.
Default: + (enabled).
-H:ParsingContextMaxDepth=100 Limit the parsing context depth. Default value is arbitrary set at 100.
-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:±PerfDataMemoryMappedFile Determines if the collected performance data should be written to a memory-mapped file so that it can be accessed by
external tools. Default: + (enabled).
-H:±PinnedObjectAddressing Allows the addresses of pinned objects to be passed to other code. Default: + (enabled).
-H:±PlatformInterfaceCompatibilityMode Enable the behavior of old GraalVM versions. When enabled, interfaces not available for the current platform are
filtered. Default: - (disabled).
-H:PredefinedClassesConfigurationFiles=<path>*
Files describing predefined classes that can be loaded at runtime.
-H:PredefinedClassesConfigurationResources=<string>*
Resources describing predefined classes that can be loaded at runtime.
-H:±PreferUnsignedComparison Rewrite signed comparisons to unsigned ones if the result is equal. Default: + (enabled).
-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:±PrintBBInfo Enables dumping of basic blocks relative PC and frequencies in the dump directory. 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:±PrintGraphStateDiff Prints the difference in the graph state caused by each phase of the suite. Default: - (disabled).
-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:±PrintImageHeapConnectedComponents A native-image run with the flag `-H:+PrintImageHeapConnectedComponents` will create reports that can help us debug
which objects got into the native image heap and why. A component represents a set of objects in the image heap.
Default: - (disabled). [Extra help available]
-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:±PrintLoweringScheduleToTTY Print schedule result pre lowering to TTY. Default: - (disabled).
-H:±PrintMethodHistogram Print statistics of methods in native image heap. Default: - (disabled).
-H:±PrintPointsToStatistics Report analysis statistics. Default: - (disabled).
-H:±PrintProfileLoading Print to stdout when a profile is loaded. 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:±PrintRuntimeCompilationCallTree Print call tree of methods reachable for runtime compilation. Default: - (disabled).
-H:±PrintRuntimeCompileMethods Print 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:ProfileMethodFilter=... Restrict saving or loading of profiles based on this filter. See the MethodFilter option for the pattern syntax.
Default: None
-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=<path>* 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:±RemoveLoopSafepoints Remove safepoints on counted loop ends. Default: + (enabled).
-H:±RemoveNeverExecutedCode Default: + (enabled).
-H:±RemoveSaturatedTypeFlows Enable the type flow saturation analysis performance optimization. Default: + (enabled).
-H:±RemoveUnneededDeoptSupport Remove Deopt(Entries,Anchors,Proxies) determined to be unneeded after the runtime compiled graphs have been finalized.
Default: - (disabled).
-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=<path>* 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:±RunMainInNewThread Initializes and runs main entry point in a new native thread. 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:±RuntimeCompilationInlineBeforeAnalysis Perform InlineBeforeAnalysis on runtime compiled methods. Default: + (enabled).
-H:±RuntimeSystemAssertions Enable or disable Java system assertions at run time. Default: - (disabled).
-H:SafepointSamplerStats="" Dump some stats about the safepoint sampler into a file on this path.
-H:±SaveProfiles Save per compilation profile information. Default: - (disabled).
-H:SaveProfilesPath=... Path for saving compilation profiles. If the value is omitted the debug dump path will be used. Default: None
-H:±ScanObjectsParallel Object scanning in parallel. Default: + (enabled).
-H:SerializationConfigurationFiles=<path>* 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=<path>*
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:±SignalHandlerBasedExecutionSampler Determines if JFR uses a signal handler for execution sampling. Default: - (disabled).
-H:±SimpleFastInflatedLocking Handle simple cases for inflated monitors in the fast-path. Default: + (enabled).
-H:±SimulateClassInitializer Simulate the effects of class initializer at image build time, to avoid class initialization at run time. Default: +
(enabled).
-H:±SimulateClassInitializerCollectAllReasons
Configuration for SimulateClassInitializer: Collect all reasons why a class initializer cannot be simulated. Default: -
(disabled).
-H:SimulateClassInitializerMaxAllocatedBytes=40000
Configuration for SimulateClassInitializer: Maximum number of bytes allocated in the image heap for each class
initializer.
-H:SimulateClassInitializerMaxInlineDepth=200
Configuration for SimulateClassInitializer: Maximum inlining depth during simulation.
-H:SimulateClassInitializerMaxLoopIterations=2000
Configuration for SimulateClassInitializer: Maximum number of loop iterations that are unrolled during simulation.
-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 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. Serial GC only.
-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. Default: + (enabled).
-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:±SpeculativeExecutionBarriers Stop speculative execution on all branch targets with execution barrier instructions. 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 Deprecated, has no effect. 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:±StrengthenGraphWithConstants Perform constant folding in StrengthenGraphs. Default: + (enabled).
-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:±StrictProfiles Throw an error if an attempt is made to overwrite/update a profile loaded from disk. Default: + (enabled).
-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:±StripDebugInfo Use a separate file for debug info. Default: + (enabled).
-H:±SupportCompileInIsolates Support runtime compilation in separate isolates (enable at runtime with option CompileInIsolates).
-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:SystemicCompilationFailureRate=1 Compilation failure rate indicating a systemic compilation problem that will issue a warning. The value is made absolute
and clamped to produce P, a value between 0 and 100. Systemic failure is detected if the percent of failing
compilations in a sliding time window >= P. A negative value will cause the VM to exit after issuing the warning. Set
to 0 to disable systemic compilation problem detection.
-H:TargetPlatform="" Selects native-image compilation target (in <OS>-<architecture> format). Defaults to host's OS-architecture pair.
-H:TempDirectory=<path>* 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:ThrowMissingRegistrationErrors=<string>* Throw Native Image-specific errors when trying to access an element that has not been registered. [Extra help available]
-H:ThrowMissingRegistrationErrorsPaths=<string>*
Trigger missing registration errors from all types in the given class or module-path entries. [Extra help available]
-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=<string>* 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=<string>* 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:±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:±TruffleCheckPreinitializedFiles Check that context pre-initialization does not introduce absolute TruffleFiles into the image heap. 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:TruffleHostInliningMaxSubtreeInvokes=20 Maximum number of subtree invokes for a subtree to get inlined until it is considered too complex.
-H:TruffleHostInliningMinFrequency=0.001 Minimum relative frequency for calls to get inlined. Default 0.001 on HotSpot and no minimum frequency on SVM.
-H:±TruffleHostInliningPrintExplored When logging is activated for this phase enables printing of only explored, but ultimately not inlined call trees.
Default: - (disabled).
-H:±TruffleImmutableFrameFields Whether Truffle should mark final frame fields as immutable. Default: + (enabled).
-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:±TruffleTrustedNonNullCast Whether Truffle trusted non-null casts are enabled. Default: + (enabled).
-H:±TruffleTrustedTypeCast Whether Truffle trusted type casts are enabled. Default: + (enabled).
-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:±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:±UseDeprecatedOldClassInitialization Use the old class initialization strategy that does not allow all classes to be used at image build time. 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:±UseExperimentalReachabilityAnalysis Use experimental Reachability Analysis instead of points-to. Default: - (disabled).
-H:±UseImagebuildDebugSections Emit debuginfo debug.svm.imagebuild.* sections with detailed image-build options. Default: + (enabled).
-H:±UseLLVMDataSection Use LLVM to emit data section. Default: - (disabled).
-H:UseLibC=... Selects the libc implementation to use. Available implementations: glibc, musl, bionic. Default: None
-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:±UseReachabilityMethodSummaries Use method summaries for Reachability Analysis. Default: - (disabled).
-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:UsedEdenProportionThreshold=0.75 Ratio of used bytes to total allocated bytes for eden space. Setting it to a smaller value will trade more triggered
hinted GCs for less resident set size.
-H:Verify=... Pattern for specifying scopes in which logging is enabled. See the Dump option for the pattern syntax. Default: None
-H:±VerifyAfterGC Verify the heap after doing a garbage collection if VerifyHeap is enabled. Serial GC only. Default: + (enabled).
-H:±VerifyBalancedMonitors Emit extra code to dynamically check monitor operations are balanced. Default: - (disabled).
-H:±VerifyBeforeGC Verify the heap before doing a garbage collection if VerifyHeap is enabled. Serial GC only. Default: + (enabled).
-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. Serial GC only. Default: + (enabled).
-H:±VerifyReferencesPointIntoValidChunk Verify that object references point into valid heap chunks if VerifyHeap is enabled. Serial GC only. Default: -
(disabled).
-H:±VerifyRememberedSet Verify the remembered set if VerifyHeap is enabled. Serial GC only. 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. Serial GC only. Default: - (disabled).
-H:±WarnAboutCodeSignatureMismatch Print to stdout when a compilation performed with different profiles generates different backend code. Default: +
(enabled).
-H:±WarnAboutGraphSignatureMismatch Print to stdout when a compilation performed with different profiles generates different frontend IR. Default: +
(enabled).
-H:±WarnAboutNotCachedLoadedAccess Print to stdout when requesting profiling info not present in a loaded profile. Default: + (enabled).
-H:±WarnMissingIntrinsic Print a warning when a missing intrinsic is seen. Default: - (disabled).
-H:±ZapChunks Fill unused memory chunks with a sentinel value. Serial and epsilon GC only. Default: - (disabled).
-H:±ZapConsumedHeapChunks After use, Fill memory chunks with a sentinel value. Serial and epsilon GC only. Default: - (disabled).
-H:±ZapProducedHeapChunks Before use, fill memory chunks with a sentinel value. Serial and epsilon GC only. Default: - (disabled).
-H:±ZapStackOnMethodEntry Default: - (disabled).
-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: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:±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. Serial GC only.
-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=300.0 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:CompilationWatchDogStartDelay=0 Delay in seconds before watch dog monitors a compilation (0 disables monitoring).
-R:CompilationWatchDogVMExitDelay=0 Number of seconds after which a compilation appearing to make no progress causes the VM to exit (0 disables VM exiting).
-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:±ConditionalEliminationBeforeAnalysis Run conditional elimination before static analysis. 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:DefaultLoopFrequency=100.0 Default frequency for loops with unknown local frequency.
-R:DefaultUnswitchFactor=0.7 Default unswitching factor for control split node with unkown profile data.
-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:±DisableABCE Disable array bounds check elimations. Default: + (enabled).
-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: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: + (enabled).
-R:±EarlyLICM Perform early loop invariant code motion. Default: + (enabled).
-R:±EmitStringSubstitutions Emit substitutions for String methods. Default: + (enabled).
-R:±EnableSignalHandling Enables signal handling.
-R:±EscapeAnalysisBeforeAnalysis Run partial escape analysis on compiler graphs before static analysis. Default: + (enabled).
-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:±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:±ForceExplicitReachabilityFence Force an explicit compiler node for Reference.reachabilityFence, instead of relying on FrameState liveness. Default: -
(disabled).
-R:±FullUnroll Default: + (enabled).
-R:FullUnrollCodeSizeBudgetFactorForLargeGraphs=2.0
Maximum factor by which full unrolling can increase code size for large graphs. The FullUnrollSmallGraphThreshold option
determines which graphs are small.
-R:FullUnrollCodeSizeBudgetFactorForSmallGraphs=10.0
Maximum factor by which full unrolling can increase code size for small graphs. The FullUnrollSmallGraphThreshold option
determines which graphs are small.
-R:FullUnrollConstantCompareBoost=15
-R:FullUnrollMaxApplication=60
-R:FullUnrollMaxIterations=600
-R:FullUnrollMaxNodes=400
-R:FullUnrollSmallGraphThreshold=1000 The threshold in terms of NodeSize for a graph to be considered small for the purpose of full unrolling. Applied in
conjunction with the FullUnrollCodeSizeBudgetFactorForSmallGraphs and FullUnrollCodeSizeBudgetFactorForLargeGraphs
options.
-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:HeapDumpPath="" The path (filename or directory) where heap dumps are created (defaults to the working directory).
-R:HeapVerifierVerbosity=0 Control heap verifier verbosity level: 0 - quiet, 1 - info, 2 - warning, 3 - all.
-R:HotCodeMinSelfTime=0.001 Minimal self time for a compilation unit to be considered hot globally.
-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: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:InjectedCompilationDelay=0 The number of seconds by which to slow down each compilation. The compilations slowed down can be restricted with
MethodFilter. This option exists to test the compilation watchdog.
-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:±InlineGraalStubs Embed all the emitted code for Graal-generated stubs. 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, disabled when EnableSignalHandling is disabled.
-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:LIRInstructionVerifierPath=... Path to jar file containing LIR instruction verifier. Default: None
-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:LoadProfiles=... Load per compilation profile information. Default: None
-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=20.0 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=20 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=0 The maximum number of constant objects recorded for each type before merging the constants into one unique constant
object per type. If the value is 0 there is no limit.
-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). Serial GC only.
-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:MaxUnswitchSuccessors=64 Maximum number of split successors before aborting unswitching.
-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. Serial and epsilon GC only.
-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. Serial and epsilon GC only.
-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: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:OptimizationLog=... Enable the structured optimization log and specify where it is printed. Default: None [Extra help available]
-R:OptimizationLogPath=... Path to the directory where the optimization log is saved if OptimizationLog is set to Directory. Directories are
created if they do no exist. Default: None
-R:±OptimizeReturnedParameter Analysis: Detect methods that return one of their parameters and hardwire the parameter straight to the return. Default:
+ (enabled).
-R:±OverrideProfiles Allow multiple compilations of the same method by overriding existing profiles. Default: - (disabled).
-R:ParsingContextMaxDepth=100 Limit the parsing context depth. Default value is arbitrary set at 100.
-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. Serial GC with collection
policy 'BySpaceAndTime' only.
-R:PerfDataMemorySize=32768 Size of performance data memory region. Will be rounded up to a multiple of the native os page size.
-R:PerfDataSamplingInterval=200 Jvmstat instrumentation sampling interval (in milliseconds).
-R:PerfMaxStringConstLength=1024 Maximum PerfStringConstant string length before truncation.
-R:±PreferUnsignedComparison Rewrite signed comparisons to unsigned ones if the result is equal. 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:±PrintBBInfo Enables dumping of basic blocks relative PC and frequencies in the dump directory. 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. Serial GC only. Default: - (disabled).
-R:±PrintGCTimeStamps Print a time stamp at each collection, if +PrintGC or +VerboseGC. Serial GC only. Default: - (disabled).
-R:±PrintGCTimes Print the time for each of the phases of each collection, if +VerboseGC. Serial GC only. 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:±PrintGraphStateDiff Prints the difference in the graph state caused by each phase of the suite. Default: - (disabled).
-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. Serial GC only. 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:±PrintLoweringScheduleToTTY Print schedule result pre lowering to TTY. Default: - (disabled).
-R:±PrintPointsToStatistics Report analysis statistics. Default: - (disabled).
-R:±PrintProfileLoading Print to stdout when a profile is loaded. 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:ProfileMethodFilter=... Restrict saving or loading of profiles based on this filter. See the MethodFilter option for the pattern syntax.
Default: None
-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:±RemoveLoopSafepoints Remove safepoints on counted loop ends. 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:±SaveProfiles Save per compilation profile information. Default: - (disabled).
-R:SaveProfilesPath=... Path for saving compilation profiles. If the value is omitted the debug dump path will be used. Default: None
-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:±SpeculativeExecutionBarriers Stop speculative execution on all branch targets with execution barrier instructions. 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:±StrengthenGraphWithConstants Perform constant folding in StrengthenGraphs. Default: + (enabled).
-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:±StrictProfiles Throw an error if an attempt is made to overwrite/update a profile loaded from disk. Default: + (enabled).
-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:SystemicCompilationFailureRate=1 Compilation failure rate indicating a systemic compilation problem that will issue a warning. The value is made absolute
and clamped to produce P, a value between 0 and 100. Systemic failure is detected if the percent of failing
compilations in a sliding time window >= P. A negative value will cause the VM to exit after issuing the warning. Set
to 0 to disable systemic compilation problem detection.
-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. Serial GC only. 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:TruffleHostInliningMaxSubtreeInvokes=20 Maximum number of subtree invokes for a subtree to get inlined until it is considered too complex.
-R:TruffleHostInliningMinFrequency=0.001 Minimum relative frequency for calls to get inlined. Default 0.001 on HotSpot and no minimum frequency on SVM.
-R:±TruffleHostInliningPrintExplored When logging is activated for this phase enables printing of only explored, but ultimately not inlined call trees.
Default: - (disabled).
-R:±TruffleImmutableFrameFields Whether Truffle should mark final frame fields as immutable. Default: + (enabled).
-R:±TruffleTrustedNonNullCast Whether Truffle trusted non-null casts are enabled. Default: + (enabled).
-R:±TruffleTrustedTypeCast Whether Truffle trusted type casts are enabled. Default: + (enabled).
-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:±UseExperimentalReachabilityAnalysis Use experimental Reachability Analysis instead of points-to. Default: - (disabled).
-R:±UseLoopEndFrequencies Derive loop frequencies only from backedge frequencies instead of from loop exit frequencies. Default: - (disabled).
-R:±UseLoopLimitChecks Default: + (enabled).
-R:±UsePerfData Flag to disable jvmstat instrumentation for performance testing. Default: + (enabled).
-R:±UseReachabilityMethodSummaries Use method summaries for Reachability Analysis. Default: - (disabled).
-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:±WarnAboutCodeSignatureMismatch Print to stdout when a compilation performed with different profiles generates different backend code. Default: +
(enabled).
-R:±WarnAboutGraphSignatureMismatch Print to stdout when a compilation performed with different profiles generates different frontend IR. Default: +
(enabled).
-R:±WarnAboutNotCachedLoadedAccess Print to stdout when requesting profiling info not present in a loaded profile. Default: + (enabled).
-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).
[JVMCI properties]
jvmci.Compiler = null [String]
Selects the system compiler. This must match the getCompilerName() value returned by a jdk.vm.ci.runtime.JVMCICompilerFactory provider. An empty string or the value "null" selects a compiler that will raise an exception upon receiving a compilation request.
jvmci.InitTimer = false [Boolean]
Specifies if initialization timing is enabled.
jvmci.ForceTranslateFailure = null [String]
Forces HotSpotJVMCIRuntime.translate to throw an exception in the context of the peer runtime. The value is a filter that can restrict the forced failure to matching translated objects. See HotSpotJVMCIRuntime.postTranslation for more details. This option exists soley to test correct handling of translation failure.
jvmci.PrintConfig = false [Boolean]
Prints VM configuration available via JVMCI.
jvmci.AuditHandles = false [Boolean]
Record stack trace along with scoped foreign object reference wrappers to debug issue with a wrapper being used after its scope has closed.
jvmci.TraceMethodDataFilter = null [String]
Enables tracing of profiling info when read by JVMCI.
Empty value: trace all methods
Non-empty value: trace methods whose fully qualified name contains the value.
jvmci.UseProfilingInformation = true [Boolean]
[Graal properties]
graal.AbortOnBenchmarkCounterOverflow = false [Boolean]
Abort VM with SIGILL if benchmark counters controlled by the
(Generic|Timed|Benchmark)DynamicCounters
option overflow. WARNING: No descriptive error message will be printed! In
case of an overflow, manual inspection of the emitted code is required.
graal.AggregatedMetricsFile = null [String]
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.
graal.AlwaysInlineIntrinsics = false [Boolean]
Unconditionally inline intrinsics
graal.AlwaysInlineVTableStubs = false [Boolean]
graal.ArrayRegionEqualsConstantLimit = 4096 [Integer]
Array region equality checks will be evaluated at compile time if the
receiver is a constant and its length is smaller than this value.
graal.BenchmarkCounterPrintingCutoff = true [Boolean]
Use a cutoff to print only most significant counters.
graal.BenchmarkCountersDumpDynamic = true [Boolean]
Dump dynamic counters
graal.BenchmarkCountersDumpStatic = false [Boolean]
Dump static counters
graal.BenchmarkCountersFile = null [String]
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
graal.BenchmarkDynamicCounters = null [String]
Turn on the benchmark counters. The format of this option is:
(err|out),start pattern,end pattern
Start counting when the start pattern matches on the given stream and stop when the end pattern occurs.
You can use "~" to match 1 or more digits.
Examples:
err, starting =====, PASSED in
out,Iteration ~ (~s) begins:,Iteration ~ (~s) ends:
The first pattern matches DaCapo output and the second matches SPECjvm2008 output.
As a more detailed example, here are the options to use for getting statistics
about allocations within the DaCapo pmd benchmark:
-XX:JVMCICounterSize=<value> -XX:-JVMCICountersExcludeCompiler \
-Dgraal.BenchmarkDynamicCounters="err, starting ====, PASSED in " \
-Dgraal.ProfileAllocations=true
The JVMCICounterSize value depends on the granularity of the profiling -
10000 should be sufficient. Omit JVMCICountersExcludeCompiler to exclude
counting allocations on the compiler threads.
The counters can be further configured by the ProfileAllocationsContext option.
We highly recommend the use of -Dgraal.AbortOnBenchmarkCounterOverflow=true to
detect counter overflows eagerly.
graal.BootstrapInitializeOnly = false [Boolean]
Do not compile anything on bootstrap but just initialize the compiler.
graal.BootstrapTimeout = 15.0 [Double]
Maximum time in minutes to spend bootstrapping (0 to disable this
limit).
graal.BootstrapWatchDogCriticalRateRatio = 0.25 [Double]
Ratio of the maximum compilation rate below which the bootstrap
compilation rate must not fall (0 or less disables monitoring).
graal.BoundsCheckElimination = true [Boolean]
graal.CanonicalGraphStringsCheckConstants = false [Boolean]
Exclude virtual nodes when dumping canonical text for graphs.
graal.CanonicalGraphStringsExcludeVirtuals = true [Boolean]
Exclude virtual nodes when dumping canonical text for graphs.
graal.CanonicalGraphStringsRemoveIdentities = true [Boolean]
Attempts to remove object identity hashes when dumping canonical text
for graphs.
graal.ClearMetricsAfterBootstrap = false [Boolean]
Clear the debug metrics after bootstrap.
graal.CompilationBailoutAsFailure = false [Boolean]
Treat compilation bailouts like compilation failures.
graal.CompilationCountLimit = 0 [Integer]
The number of compilations allowed for any method before the VM exits
(a value of 0 means there is no limit).
graal.CompilationExcludePhases = null [String]
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.
graal.CompilationExpirationPeriod = 300.0 [Double]
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.
graal.CompilationFailureAction := Diagnose [String]
Specifies the action to take when compilation fails.
The accepted values are:
Silent - Print nothing to the console.
Print - Print a stack trace to the console.
Diagnose* - Retry the compilation with extra diagnostics.
ExitVM - Same as Diagnose except that the VM process exits after retrying.
* If "Diagnose" is set compilation will be retried with extra diagnostics enabled including dumping (see file:doc-files/DumpHelp.txt).
In such a scenario DiagnoseDumpLevel can be used to specify the dump level (DebugContext dump levels) accordingly.
graal.CompilationWatchDogStartDelay = 0 [Integer]
Delay in seconds before watch dog monitors a compilation (0 disables
monitoring).
graal.CompilationWatchDogVMExitDelay = 0 [Integer]
Number of seconds after which a compilation appearing to make no
progress causes the VM to exit (0 disables VM exiting).
graal.CompileGraalWithC1Only = true [Boolean]
In tiered mode compile Graal and JVMCI using optimized first tier code.
graal.CompilerConfiguration = null [String]
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.
graal.ConditionalElimination = true [Boolean]
graal.ConditionalEliminationMaxIterations = 4 [Integer]
graal.Count = null [String]
Pattern for specifying scopes in which counters are enabled. See the
Dump option for the pattern syntax. An empty value enables all counters
unconditionally.
graal.Counters = null [String]
Comma separated names of counters that are enabled irrespective of the
value for Count option. An empty value enables all counters
unconditionally.
graal.CrashAt = null [String]
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.
graal.DebugStubsAndSnippets = false [Boolean]
Enable debug output for stub code generation and snippet preparation.
graal.DefaultLoopFrequency = 100.0 [Double]
Default frequency for loops with unknown local frequency.
graal.DefaultUnswitchFactor = 0.7 [Double]
Default unswitching factor for control split node with unkown profile
data.
graal.DeoptALot = false [Boolean]
graal.DeoptAfterOSR = true [Boolean]
Deoptimize OSR compiled code when the OSR entry loop is finished if
there is no mature profile available for the rest of the method.
graal.DeoptsToDisableOptimisticOptimization = 40 [Integer]
graal.DetailedAsserts = false [Boolean]
Enable expensive assertions if normal assertions (i.e. -ea or -esa) are
enabled.
graal.DiagnoseDumpLevel = 3 [Integer]
Specify the dump level if CompilationFailureAction#Diagnose is used.See
CompilationFailureAction for details.
file:doc-files/CompilationFailureActionHelp.txt
graal.DisableABCE = true [Boolean]
Disable array bounds check elimations
graal.DisableIntercept = false [Boolean]
Disable intercepting exceptions in debug scopes.
graal.DisableIntrinsics = null [String]
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').
graal.Dump = null [String]
Filter pattern for specifying scopes in which dumping is enabled.
A filter is a list of comma-separated terms of the form:
<pattern>[:<level>]
If <pattern> contains a "*" or "?" character, it is interpreted as a glob pattern.
Otherwise, it is interpreted as a substring. If <pattern> is empty, it
matches every scope. If :<level> is omitted, it defaults to 1. The term
~<pattern> is a shorthand for <pattern>:0 to disable a debug facility for a pattern.
The default log level is 0 (disabled). Terms with an empty pattern set
the default log level to the specified value. The last
matching term with a non-empty pattern selects the level specified. If
no term matches, the log level is the default level. A filter with no
terms matches every scope with a log level of 1.
Examples of debug filters:
---------
(empty string)
Matches any scope with level 1.
---------
:1
Matches any scope with level 1.
---------
*
Matches any scope with level 1.
---------
CodeGen,CodeInstall
Matches scopes containing "CodeGen" or "CodeInstall", both with level 1.
---------
CodeGen:2,CodeInstall:1
Matches scopes containing "CodeGen" with level 2, or "CodeInstall" with level 1.
---------
Outer:2,Inner:0}
Matches scopes containing "Outer" with log level 2, or "Inner" with log level 0. If the scope
name contains both patterns then the log level will be 0. This is useful for silencing subscopes.
---------
:1,Dead:2
Matches scopes containing "Dead" with level 2, and all other scopes with level 1.
---------
Dead:0,:1
Matches all scopes with level 1, except those containing "Dead". Note that the location of
the :1 doesn't matter since it's specifying the default log level so it's the same as
specifying :1,Dead:0.
---------
Code*
Matches scopes starting with "Code" with level 1.
---------
Code,~Dead
Matches scopes containing "Code" but not "Dead", with level 1.
graal.DumpAfterEveryBCI = false [Boolean]
Dump the current graph after every bci to IGV.
graal.DumpEndVersusExitLoopFrequencies = false [Boolean]
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.
graal.DumpOnError := true [Boolean]
Send compiler IR to dump handlers on error.
graal.DumpOnPhaseChange = null [String]
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
graal.DumpPath = "graal_dumps" [String]
The directory where various Graal dump files are written.
graal.DumpingErrorsAreFatal = false [Boolean]
Treat any exceptions during dumping as fatal.
graal.DynamicCountersPrintGroupSeparator = true [Boolean]
Use grouping separators for number printing
graal.EagerSnippets = false [Boolean]
Eagerly construct extra snippet info.
graal.EarlyCodeEmissionOrder = false [Boolean]
Enable early code emission order computation instead of late code
emission order computation
graal.EarlyGVN = true [Boolean]
Perform early global value numbering.
graal.EarlyLICM = true [Boolean]
Perform early loop invariant code motion.
graal.EmitStringSubstitutions = true [Boolean]
Emit substitutions for String methods
graal.EscapeAnalysisIterations = 2 [Integer]
graal.EscapeAnalysisLoopCutoff = 20 [Integer]
graal.EscapeAnalyzeOnly = null [String]
graal.ExactFullUnrollMaxNodes = 800 [Integer]
graal.ExactPartialUnrollMaxNodes = 200 [Integer]
graal.FailedLoopExplosionIsFatal = false [Boolean]
Do not bail out but throw an exception on failed loop explosion.
graal.FloatingDivNodes = true [Boolean]
Try to float non-constant division operations to expose global value
numbering of divisions.
graal.ForceAdversarialLayout = false [Boolean]
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.
graal.ForceExplicitReachabilityFence = false [Boolean]
Force an explicit compiler node for Reference.reachabilityFence,
instead of relying on FrameState liveness
graal.FullUnroll = true [Boolean]
graal.FullUnrollCodeSizeBudgetFactorForLargeGraphs = 2.0 [Double]
Maximum factor by which full unrolling can increase code size for large
graphs. The FullUnrollSmallGraphThreshold option determines which
graphs are small
graal.FullUnrollCodeSizeBudgetFactorForSmallGraphs = 10.0 [Double]
Maximum factor by which full unrolling can increase code size for small
graphs. The FullUnrollSmallGraphThreshold option determines which
graphs are small
graal.FullUnrollConstantCompareBoost = 15 [Integer]
graal.FullUnrollMaxApplication = 60 [Integer]
graal.FullUnrollMaxIterations = 600 [Integer]
graal.FullUnrollMaxNodes = 400 [Integer]
graal.FullUnrollSmallGraphThreshold = 1000 [Integer]
The threshold in terms of NodeSize for a graph to be considered small
for the purpose of full unrolling. Applied in conjunction with the
FullUnrollCodeSizeBudgetFactorForSmallGraphs and
FullUnrollCodeSizeBudgetFactorForLargeGraphs options.
graal.GCDebugStartCycle = -1 [Integer]
Start tracing compiled GC barriers after N garbage collections
(disabled if N <= 0).
graal.GenLoopSafepoints = true [Boolean]
graal.GenericDynamicCounters = false [Boolean]
Turn on the benchmark counters, and displays the results on VM shutdown
graal.GraalArithmeticStubs = true [Boolean]
Use Graal arithmetic stubs instead of HotSpot stubs where possible
graal.GraalCompileOnly = null [String]
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.
graal.GraphCompressionThreshold = 70 [Integer]
Graal graph compression is performed when percent of live nodes falls
below this value
graal.GuardPriorities = true [Boolean]
graal.HotCodeMinSelfTime = 0.001 [Double]
Minimal self time for a compilation unit to be considered hot globally.
graal.HotSpotDeoptExplicitExceptions = false [Boolean]
Testing only option that forces deopts for exception throws
graal.HotSpotPostOnExceptions = false [Boolean]
Testing only option that forces deopts for exception throws
graal.HotSpotPrintInlining = false [Boolean]
Print inlining optimizations
graal.InjectedCompilationDelay = 0 [Integer]
The number of seconds by which to slow down each compilation. The
compilations slowed down can be restricted with MethodFilter. This
option exists to test the compilation watchdog.
graal.Inline = true [Boolean]
Enable inlining
graal.InlineDuringParsing = true [Boolean]
Inlines trivial methods during bytecode parsing.
graal.InlineDuringParsingMaxDepth = 10 [Integer]
Maximum depth when inlining during bytecode parsing.
graal.InlineEverything = false [Boolean]
graal.InlineGraalStubs = false [Boolean]
Embed all the emitted code for Graal-generated stubs.
graal.InlineMegamorphicCalls = true [Boolean]
Inline calls with megamorphic type profile (i.e., not all types could
be recorded).
graal.InlineMonomorphicCalls = true [Boolean]
Inline calls with monomorphic type profile.
graal.InlinePartialIntrinsicExitDuringParsing = true [Boolean]
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.
graal.InlinePolymorphicCalls = true [Boolean]
Inline calls with polymorphic type profile.
graal.InlineVTableStubs = true [Boolean]
graal.InliningDepthError = 1000 [Integer]
Maximum inlining depth during partial evaluation before reporting an
infinite recursion
graal.InterceptBailout = false [Boolean]
Intercept also bailout exceptions
graal.Intrinsify = true [Boolean]
Use compiler intrinsifications.
graal.IsolatedLoopHeaderAlignment = 32 [Integer]
Alignment in bytes for loop header blocks that have no fall through
paths.
graal.IterativePeelingLimit = 2 [Integer]
Allow iterative peeling of loops up to this many times (each time the
peeling phase runs).
graal.LIRDynMoveProfileMethod = false [Boolean]
Enable dynamic move profiling per method.
graal.LIRInstructionVerifierPath = null [String]
Path to jar file containing LIR instruction verifier.
graal.LIROptConstantLoadOptimization = true [Boolean]
Enable constant load optimization.
graal.LIROptControlFlowOptimizer = true [Boolean]
graal.LIROptEdgeMoveOptimizer = true [Boolean]
graal.LIROptLSRAEliminateSpillMoves = true [Boolean]
Enable spill move elimination.
graal.LIROptLSRAOptimizeSpillPosition = true [Boolean]
Enable spill position optimization
graal.LIROptLSStackSlotAllocator = true [Boolean]
Use linear scan stack slot allocation.
graal.LIROptNullCheckOptimizer = true [Boolean]
graal.LIROptRedundantMoveElimination = true [Boolean]
graal.LIROptStackMoveOptimizer = true [Boolean]
graal.LIROptimization = true [Boolean]
Enable LIR level optimizations.
graal.LIRProfileMethods = false [Boolean]
Enables profiling of methods.
graal.LIRProfileMoves = false [Boolean]
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).
graal.LSRAOptSplitOnly = false [Boolean]
LSRA optimization: Only split but do not reassign
graal.LSRAOptimization = false [Boolean]
Enable LSRA optimization
graal.LimitInlinedInvokes = 5.0 [Double]
graal.ListMetrics = false [Boolean]
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.
graal.LoadExceptionObjectInVM = false [Boolean]
Use a VM runtime call to load and clear the exception object from the
thread at the start of a compiled exception handler.
graal.LoadProfiles = null [String]
Load per compilation profile information.
graal.Log = null [String]
Pattern for specifying scopes in which logging is enabled. See the Dump
option for the pattern syntax.
graal.LogFile = null [String]
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.
graal.LogVerbose = false [Boolean]
Enable more verbose log output when available
graal.LoopExitVsLoopEndFrequencyDiff = 1000.0 [Double]
Scaling factor of frequency difference computed based on loop ends or
exits
graal.LoopHeaderAlignment = 16 [Integer]
Alignment in bytes for loop header blocks.
graal.LoopMaxUnswitch = 3 [Integer]
graal.LoopPeeling = true [Boolean]
graal.LoopPredication = true [Boolean]
Hoists array bounds checks out of simple loops. This is ignored if
SpeculativeGuardMovement is enabled.
graal.LoopPredicationMainPath = true [Boolean]
Restricts LoopPredication to only focus on array bounds checks that
dominate the back edge of a loop.
graal.LoopUnswitch = true [Boolean]
graal.LoopUnswitchFrequencyBoost = 20.0 [Double]
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.
graal.LoopUnswitchFrequencyMaxFactor = 0.95 [Double]
Maximun value for the frequency factor of an invariant.
graal.LoopUnswitchFrequencyMinFactor = 0.05 [Double]
Minimum value for the frequency factor of an invariant.
graal.LoopUnswitchMaxIncrease = 2000 [Integer]
Maximum loop unswitching code size increase in nodes.
graal.LoopUnswitchMinSplitFrequency = 1.0 [Double]
Lower bound for the minimun frequency of an invariant condition to be
unswitched.
graal.LoopUnswitchTrivial = 20 [Integer]
Number of nodes allowed for a loop unswitching regardless of the loop
frequency.
graal.MatchExpressions = true [Boolean]
Allow backend to match complex expressions.
graal.MaxCompilationProblemsPerAction = 2 [Integer]
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.
graal.MaxDuplicationFactor = 2.0 [Double]
Max amount of extra effort to expend handling irreducible loops. A
value <= 1 disables support for irreducible loops.
graal.MaxTemplatesPerSnippet = 50 [Integer]
graal.MaxUnswitchSuccessors = 64 [Integer]
Maximum number of split successors before aborting unswitching.
graal.MaximumDesiredSize = 20000 [Integer]
Maximum desired size of the compiler graph in nodes.
graal.MaximumEscapeAnalysisArrayLength = 128 [Integer]
The maximum length of an array that will be escape analyzed.
graal.MaximumInliningSize = 300 [Integer]
Inlining is explored up to this number of nodes in the graph for each
call site.
graal.MaximumLoopExplosionCount = 10000 [Integer]
Max number of loop explosions per method.
graal.MaximumRecursiveInlining = 5 [Integer]
Maximum level of recursive inlining.
graal.MegamorphicInliningMinMethodProbability = 0.33 [Double]
Minimum probability for methods to be inlined for megamorphic type
profiles.
graal.MemUseTrackers = null [String]
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.
graal.MethodFilter = null [String]
Pattern for matching methods. The syntax for a pattern is:
SourcePatterns = SourcePattern ["," SourcePatterns] .
SourcePattern = [ "~" ] [ Class "." ] method [ "(" [ Parameter { ";" Parameter } ] ")" ] .
Parameter = Class | "int" | "long" | "float" | "double" | "short" | "char" | "boolean" .
Class = { package "." } class .
Glob pattern matching (*, ?) is allowed in all parts of the source pattern.
The "~" prefix negates the pattern.
Positive patterns are joined by an "or" operator: "A,B" matches anything
matched by "A" or "B". Negative patterns are joined by "and not": "~A,~B"
matches anything not matched by "A" and not matched by "B". "A,~B,~C,D"
matches anything matched by "A" or "D" and not matched by "B" and not
matched by "C".
A set of patterns containing negative patterns but no positive ones contains
an implicit positive "*" pattern: "~A,~B" is equivalent to "*,~A,~B".
Examples of method filters:
---------
*
Matches all methods in all classes.
---------
canonical(CanonicalizerTool;LogicNode;LogicNode)
Matches all methods named "canonical", with the first parameter of type
"CanonicalizerTool", and the second and third parameters of type
"LogicNode".
The packages of the parameter types are irrelevant.
---------
arraycopy(Object;;;;)
Matches all methods named "arraycopy", with the first parameter
of type "Object", and four more parameters of any type. The
packages of the parameter types are irrelevant.
---------
List.set
Matches all methods named "set" in a class whose simple name is "List".
---------
*List.set
Matches all methods named "set" in a class whose simple name ends with "List".
---------
org.graalvm.compiler.nodes.PhiNode.*
Matches all methods in the class "org.graalvm.compiler.nodes.PhiNode".
---------
org.graalvm.compiler.nodes.*.canonical
Matches all methods named "canonical" in classes in the package
"org.graalvm.compiler.nodes".
---------
arraycopy,toString
Matches all methods named "arraycopy" or "toString", meaning that ',' acts
as an "or" operator.
---------
java.util.*.*.,~java.util.*Array*.*
java.util.*.*.,~*Array*.*
These patterns are equivalent and match all methods in the package
"java.util" except for classes that have "Array" in their name.
---------
~java.util.*.*
Matches all methods in all classes in all packages except for anything in
the "java.util" package.
graal.MethodFilterRootOnly = false [Boolean]
Only check MethodFilter against the root method in the context if true,
otherwise check all methods
graal.MethodInlineBailoutLimit = 5000 [Integer]
Per-compilation method inlining exploration limit before giving up (use
0 to disable)
graal.MetricsFile = null [String]
File to which metrics are dumped per compilation.
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:
compilable - method being compiled
compilable_identity - identity hash code of compilable
compilation_nr - where this compilation lies in the ordered
sequence of all compilations identified by
compilable_identity
compilation_id - runtime issued identifier for the compilation
metric_name - name of metric
metric_value - value of metric
graal.MinimalBulkZeroingSize = 2048 [Integer]
If applicable, use bulk zeroing instructions when the zeroing size in
bytes exceeds this threshold.
graal.MinimalGraphNodeSizeCheckSize = 1000 [Integer]
Minimal size in NodeSize to check the graph size increases of phases.
graal.MinimumPeelFrequency = 0.35 [Float]
graal.MoveGuardsUpwards = true [Boolean]
Move guard nodes to earlier places in the dominator tree if all
successors of basic block share a common guard condition.
graal.NDCV = 0 [Integer]
Run level for NoDeadCodeVerifyHandler (0 = off, 1 = info, 2 = verbose,
3 = fatal)
graal.ObjdumpExecutables := "objdump,gobjdump" [String]
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.
graal.OmitHotExceptionStacktrace = false [Boolean]
graal.OptAssumptions = true [Boolean]
graal.OptConvertDeoptsToGuards = true [Boolean]
graal.OptDeoptimizationGrouping = true [Boolean]
graal.OptDevirtualizeInvokesOptimistically = true [Boolean]
graal.OptEarlyReadElimination = true [Boolean]
graal.OptEliminateGuards = true [Boolean]
graal.OptFloatingReads = true [Boolean]
graal.OptImplicitNullChecks = true [Boolean]
graal.OptReadElimination = true [Boolean]
graal.OptScheduleOutOfLoops = true [Boolean]
graal.OptimizationLog = null [EconomicSet]
Enable the structured optimization log and specify where it is printed.
The accepted values are:
Directory - Format the structured optimization log as JSON and print it to files in a directory.
The directory is specified by OptimizationLogPath. If OptimizationLogPath is not set,
the target directory is DumpPath/optimization_log.
Stdout - Print the structured optimization log to the standard output.
Dump - Dump optimization trees for IdealGraphVisualizer according to the PrintGraph option.
It is possible to specify multiple comma-separated values.
graal.OptimizationLogPath = null [String]
Path to the directory where the optimization log is saved if
OptimizationLog is set to Directory. Directories are created if they do
no exist.
graal.OverrideProfiles = false [Boolean]
Allow multiple compilations of the same method by overriding existing
profiles.
graal.PartialEscapeAnalysis = true [Boolean]
graal.PartialUnroll = true [Boolean]
graal.PeelALot = false [Boolean]
graal.PreferUnsignedComparison = true [Boolean]
Rewrite signed comparisons to unsigned ones if the result is equal.
graal.PrintBBInfo = false [Boolean]
Enables dumping of basic blocks relative PC and frequencies in the dump
directory.
graal.PrintBackendCFG = false [Boolean]
Enable dumping scheduled HIR, LIR, register allocation and code
generation info to the C1Visualizer.
graal.PrintBlockMapping = false [Boolean]
Enable dumping CFG built during initial BciBlockMapping
graal.PrintCanonicalGraphStringFlavor = 0 [Integer]
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)
graal.PrintCanonicalGraphStrings = false [Boolean]
Enable dumping canonical text from for graphs.
graal.PrintCompilation = false [Boolean]
Print an informational line to the console for each completed
compilation.
graal.PrintGraph := Network [String]
Where IdealGraphVisualizer graph dumps triggered by Dump or DumpOnError
should be written.
The accepted values are:
File - Dump IGV graphs to the local file system (see DumpPath).
Network - Dump IGV graphs to the network destination specified by PrintGraphHost and PrintGraphPort.
If a network connection cannot be opened, dumping falls back to file dumping.
Disable - Do not dump IGV graphs.
graal.PrintGraphFile = true [Boolean]
Setting to true sets PrintGraph=file, setting to false sets
PrintGraph=network
graal.PrintGraphHost = "127.0.0.1" [String]
Host part of the address to which graphs are dumped.
graal.PrintGraphPort = 4445 [Integer]
Port part of the address to which graphs are dumped in binary format.
graal.PrintGraphStateDiff = false [Boolean]
Prints the difference in the graph state caused by each phase of the
suite.
graal.PrintGraphWithSchedule = false [Boolean]
Schedule graphs as they are dumped.
graal.PrintIRWithLIR = false [Boolean]
Print HIR along side LIR as the latter is generated
graal.PrintLIRWithAssembly = false [Boolean]
Include the LIR as comments with the final assembly.
graal.PrintLoweringScheduleToTTY = false [Boolean]
Print schedule result pre lowering to TTY.
graal.PrintProfileLoading = false [Boolean]
Print to stdout when a profile is loaded.
graal.PrintProfilingInformation = false [Boolean]
Print profiling information when parsing a method's bytecode
graal.PrintUnmodifiedGraphs = true [Boolean]
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.
graal.ProfileAllocations = false [Boolean]
Enable profiling of allocation sites.
graal.ProfileAllocationsContext = AllocatingMethod [String]
Control the naming and granularity of the counters when using
ProfileAllocations.
The accepted values are:
AllocatingMethod - a counter per method
InstanceOrArray - one counter for all instance allocations and
one counter for all array allocations
AllocatedType - one counter per allocated type
AllocatedTypesInMethod - one counter per allocated type, per method
graal.ProfileCompiledMethods = false [Boolean]
graal.ProfileMethodFilter = null [String]
Restrict saving or loading of profiles based on this filter. See the
MethodFilter option for the pattern syntax.
graal.ProfileMonitors = false [Boolean]
Enable profiling of monitor operations.
graal.RawConditionalElimination = true [Boolean]
graal.ReadEliminationMaxLoopVisits = 5 [Integer]
graal.ReassociateExpressions = true [Boolean]
Re-associate loop invariants and constants.
graal.ReduceDCE = true [Boolean]
Disable optional dead code eliminations
graal.RegisterPressure = null [String]
Comma separated list of registers that register allocation is limited
to.
graal.RemoveLoopSafepoints = true [Boolean]
Remove safepoints on counted loop ends.
graal.RemoveNeverExecutedCode = true [Boolean]
graal.ReplaceInputsWithConstantsBasedOnStamps = true [Boolean]
graal.SaveProfiles = false [Boolean]
Save per compilation profile information.
graal.SaveProfilesPath = null [String]
Path for saving compilation profiles. If the value is omitted the debug
dump path will be used.
graal.ShowConfiguration = none [String]
Writes to the VM log information about the compiler configuration
selected.
graal.ShowDumpFiles := true [Boolean]
Print the name of each dump file path as it's created.
graal.ShowSubstitutionSourceInfo = false [Boolean]
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.
graal.SimpleFastInflatedLocking = true [Boolean]
Handle simple cases for inflated monitors in the fast-path.
graal.SmallCompiledLowLevelGraphSize = 330 [Integer]
If the previous low-level graph size of the method exceeds the
threshold, it is not inlined.
graal.SnippetCounters = false [Boolean]
Enable counters for various paths in snippets.
graal.SpectrePHTBarriers = None [String]
Select a strategy to mitigate speculative bounds check bypass (aka
Spectre-PHT or Spectre V1).
This is an experimental option - execution of untrusted code is not supported by GraalVM CE.
The accepted values are:
None - No mitigations are used in JIT compiled code.
AllTargets - Speculative execution on all branch targets is
stopped using speculative execution barrier instructions.
This option is equivalent to setting SpeculativeExecutionBarriers to true.
GuardTargets - Branch targets relevant to Java memory safety are instrumented
with barrier instructions. This option has less performance impact
than AllTargets.
NonDeoptGuardTargets - Same as GuardTargets, except that branches which deoptimize are not
protected since they can not be executed repeatedly and are thus less
likely to be successfully exploited in an attack.
Note that all modes except "None" will also instrument branch target blocks containing UNSAFE memory accesses
with barrier instructions.
graal.SpectrePHTIndexMasking = false [Boolean]
Mask indices to scope access to allocation size after bounds check.
graal.SpeculativeExecutionBarriers = false [Boolean]
Stop speculative execution on all branch targets with execution barrier
instructions.
graal.SpeculativeGuardMovement = true [Boolean]
Move loop invariant guards (e.g., array bounds checks) out of loops.
graal.StressExplicitExceptionCode = false [Boolean]
Stress the code emitting explicit exception throwing code.
graal.StressInvokeWithExceptionNode = false [Boolean]
Stress the code emitting invokes with explicit exception edges.
graal.StressTestEarlyReads = false [Boolean]
Stress the code by emitting reads at earliest instead of latest point.
graal.StrictDeoptInsertionChecks = false [Boolean]
Perform checks that guards and deopts aren't introduced in graphs that
should handle exceptions explicitly
graal.StrictProfiles = true [Boolean]
Throw an error if an attempt is made to overwrite/update a profile
loaded from disk.
graal.StringIndexOfConstantLimit = 4096 [Integer]
String.indexOf invocations will be evaluated at compile time if the
receiver is a constant and its length is smaller than this value.
graal.SupportJsrBytecodes = true [Boolean]
graal.SupportOSRWithLocks = true [Boolean]
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.
graal.SystemicCompilationFailureRate = 1 [Integer]
Compilation failure rate indicating a systemic compilation problem that
will issue a warning. The value is made absolute and clamped to produce
P, a value between 0 and 100. Systemic failure is detected if the
percent of failing compilations in a sliding time window >= P. A
negative value will cause the VM to exit after issuing the warning. Set
to 0 to disable systemic compilation problem detection.
graal.Time = null [String]
Pattern for specifying scopes in which timing is enabled. See the Dump
option for the pattern syntax. An empty value enables all timers
unconditionally.
graal.TimedDynamicCounters = -1 [Integer]
Turn on the benchmark counters, and displays the results every n
milliseconds
graal.Timers = null [String]
Comma separated names of timers that are enabled irrespective of the
value for Time option. An empty value enables all timers
unconditionally.
graal.TraceBytecodeParserLevel = 0 [Integer]
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.
graal.TraceEscapeAnalysis = false [Boolean]
graal.TraceExceptionHandlerStub = false [Boolean]
Trace execution of stub used to handle an exception thrown by a callee.
graal.TraceInlineDuringParsing = false [Boolean]
Traces inlining performed during bytecode parsing.
graal.TraceInlining = false [Boolean]
Enable tracing of inlining decisions.
Output format:
compilation of 'Signature of the compilation root method':
at 'Signature of the root method' ['Bytecode index']: <'Phase'> 'Child method signature': 'Decision made about this callsite'
at 'Signature of the child method' ['Bytecode index']:
|--<'Phase 1'> 'Grandchild method signature': 'First decision made about this callsite'
\--<'Phase 2'> 'Grandchild method signature': 'Second decision made about this callsite'
at 'Signature of the child method' ['Bytecode index']: <'Phase'> 'Another grandchild method signature': 'The only decision made about this callsite.'
graal.TraceInliningForStubsAndSnippets = false [Boolean]
Enable inlining decision tracing in stubs and snippets.
graal.TraceLIRGeneratorLevel = 0 [Integer]
The trace level for the LIR generator
graal.TraceMonitorsMethodFilter = null [String]
Trace monitor operations in methods whose fully qualified name contains
this substring.
graal.TraceMonitorsTypeFilter = null [String]
Trace monitor operations on objects whose type contains this substring.
graal.TraceParserPlugins = false [Boolean]
Traces use of plugins during bytecode parsing.
graal.TraceUnwindStub = false [Boolean]
Trace execution of the stub that routes an exception to a handler in
the calling frame.
graal.TrackMemUse = null [String]
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.
graal.TrackNodeInsertion = false [Boolean]
Track source stack trace where a node was inserted into the graph.
graal.TrackNodeSourcePosition := true [Boolean]
Track the NodeSourcePosition.
graal.TrivialInliningSize = 10 [Integer]
Graphs with less than this number of nodes are trivial and therefore
always inlined.
graal.TruffleCompilerConfiguration = null [String]
Select a compiler configuration for Truffle compilation (default: use
Graal system compiler configuration).
graal.TruffleHostInlining = true [Boolean]
Whether Truffle host inlining is enabled.
graal.TruffleHostInliningBaseBudget = 5000 [Integer]
Maximum budget for Truffle host inlining for runtime compiled methods.
graal.TruffleHostInliningByteCodeInterpreterBudget = 100000 [Integer]
Maximum budget for Truffle host inlining for runtime compiled methods
with a BytecodeInterpreterSwitch annotation.
graal.TruffleHostInliningMaxExplorationDepth = 1000 [Integer]
Determines the maximum call depth for exploration during host inlining.
graal.TruffleHostInliningMaxSubtreeInvokes = 20 [Integer]
Maximum number of subtree invokes for a subtree to get inlined until it
is considered too complex.
graal.TruffleHostInliningMinFrequency = 0.001 [Double]
Minimum relative frequency for calls to get inlined. Default 0.001 on
HotSpot and no minimum frequency on SVM.
graal.TruffleHostInliningPrintExplored = false [Boolean]
When logging is activated for this phase enables printing of only
explored, but ultimately not inlined call trees.
graal.TruffleImmutableFrameFields = true [Boolean]
Whether Truffle should mark final frame fields as immutable.
graal.TruffleTrustedNonNullCast = true [Boolean]
Whether Truffle trusted non-null casts are enabled.
graal.TruffleTrustedTypeCast = true [Boolean]
Whether Truffle trusted type casts are enabled.
graal.TrustFinalDefaultFields = true [Boolean]
Determines whether to treat final fields with default values as
constant.
graal.TypeCheckMaxHints = 2 [Integer]
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.
graal.TypeCheckMinProfileHitProbability = 0.5 [Double]
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
graal.UnrollMaxIterations = 16 [Integer]
graal.UseBranchesWithin32ByteBoundary = false [Boolean]
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.
graal.UseCompilationStatistics = false [Boolean]
Enables CompilationStatistics.
graal.UseExceptionProbability = true [Boolean]
graal.UseLoopEndFrequencies = false [Boolean]
Derive loop frequencies only from backedge frequencies instead of from
loop exit frequencies.
graal.UseLoopLimitChecks = true [Boolean]
graal.UseSnippetGraphCache = true [Boolean]
Use a cache for snippet graphs.
graal.UseSnippetTemplateCache = true [Boolean]
Use a LRU cache for snippet templates.
graal.UseTrappingNullChecks = true [Boolean]
Use traps for null checks instead of explicit null-checks
graal.UseTypeCheckHints = true [Boolean]
graal.Verify = null [String]
Pattern for specifying scopes in which logging is enabled. See the Dump
option for the pattern syntax.
graal.VerifyBalancedMonitors = false [Boolean]
Emit extra code to dynamically check monitor operations are balanced.
graal.VerifyGraalGraphEdges = false [Boolean]
Perform expensive verification of graph inputs, usages, successors and
predecessors
graal.VerifyGraalGraphs = true [Boolean]
Verify graphs often during compilation when assertions are turned on
graal.VerifyGraalPhasesSize = false [Boolean]
Verify before - after relation of the relative, computed, code size of
a graph
graal.VerifyHeapAtReturn = false [Boolean]
Perform platform dependent validation of the Java heap at returns
graal.VerifyKillCFGUnusedNodes = false [Boolean]
Verify that there are no new unused nodes when performing killCFG
graal.VerifyPhases = false [Boolean]
graal.WarnAboutCodeSignatureMismatch = true [Boolean]
Print to stdout when a compilation performed with different profiles
generates different backend code.
graal.WarnAboutGraphSignatureMismatch = true [Boolean]
Print to stdout when a compilation performed with different profiles
generates different frontend IR.
graal.WarnAboutNotCachedLoadedAccess = true [Boolean]
Print to stdout when requesting profiling info not present in a loaded
profile.
graal.WarnMissingIntrinsic = false [Boolean]
Print a warning when a missing intrinsic is seen.
graal.ZapStackOnMethodEntry = false [Boolean]
