OpenJDK 27 · sun.jvm.hotspot.code.NMethod · APIdia, the JavaDoc alternative

Field Summary

Modifier and Type	Field and Description
private static CIntField	compLevelField
private static CIntegerField	deoptHandlerEntryOffsetField
private static CIntegerField	entryBCIField != InvocationEntryBci if this nmethod is an on-stack replacement method
private static CIntField	entryOffsetField Entry point with class check
private static CIntegerField	exceptionOffsetField Offsets for different nmethod parts
private static CIntField	handlerTableOffsetField
private static AddressField	immutableDataField
private static CIntegerField	immutableDataRefCountOffsetField
private static long	immutableDataRefCountSize
private static CIntegerField	immutableDataSizeField
private static AddressField	methodField
private static CIntField	nulChkTableOffsetField
private static CIntegerField	origPCOffsetField
private static AddressField	osrEntryPointField Entry point for on stack replacement
private static AddressField	osrLinkField To support simple linked-list chaining of nmethods
private static long	pcDescSize
private static CIntegerField	scopesDataOffsetField
private static CIntegerField	scopesPCsOffsetField
private static CIntegerField	stubOffsetField
private static CIntField	verifiedEntryOffsetField Entry point without class check

Constructor Summary

Access	Constructor and Description
public	NMethod(Address addr)

Method Summary

Modifier and Type	Method and Description
public boolean	canBeDeoptimized() Tells whether frames described by this nmethod can be deoptimized.
public Address	constantsBegin() Boundaries for different parts
public boolean	constantsContains(Address addr)
public Address	constantsEnd()
public int	constantsSize()
public void	decodeAllScopeDescs() Attempt to decode all the debug info in this nmethod.
public Address	deoptHandlerEntry()
public Address	dependenciesBegin()
public Address	dependenciesEnd()
public int	dependenciesSize()
public Address	exceptionBegin()
pack-priv PCDesc	find_pc_desc(long pc, boolean approximate)
pack-priv PCDesc	find_pc_desc_internal(long pc, boolean approximate)
public String	flagsToString()
public Address	getAddress() Overrides sun.jvm.hotspot.runtime.VMObject.getAddress.
private int	getCompLevel()
private int	getDeoptHandlerEntryOffset()
private int	getEntryBCI()
public static int	getEntryBCIOffset()
public Address	getEntryPoint() Entry points
public int	getEntryPointOffset() Support for code generation.
private int	getExceptionOffset()
private int	getHandlerTableOffset()
private int	getImmutableDataRefCountOffset()
public int	getImmutableDataSize()
public Address	getMetadataAt(int index) Support for metadata in scopes and relocs.
public int	getMetadataLength()
public Method	getMethod()
public Method	getMethodAt(int index)
public static int	getMethodOffset()
public String	getName() Overrides sun.jvm.hotspot.code.CodeBlob.getName.
private int	getNulChkTableOffset()
public OopHandle	getOopAt(int index) Support for oops in scopes and relocs.
public int	getOopsLength()
public int	getOSREntryBCI() On-stack replacement support
public static int	getOSREntryPointOffset()
public NMethod	getOSRLink()
public PCDesc	getPCDescAt(Address pc) Finds a PCDesc with real-pc equal to "pc"
public PCDesc	getPCDescNearDbg(Address pc) This is only for use by the debugging system, and is only intended for use in the topmost frame, where we are not guaranteed to be at a PC for which we have a PCDesc.
public Map<Address, PCDesc>	getSafepoints()
public ScopeDesc	getScopeDescAt(Address pc) ScopeDesc for an instruction
public ScopeDesc	getScopeDescNearDbg(Address pc) This is only for use by the debugging system, and is only intended for use in the topmost frame, where we are not guaranteed to be at a PC for which we have a PCDesc.
private int	getScopesDataOffset()
private int	getScopesPCsOffset()
private int	getStubOffset()
public Address	getVerifiedEntryPoint()
public int	getVerifiedEntryPointOffset()
public Address	handlerTableBegin()
public boolean	handlerTableContains(Address addr)
public Address	handlerTableEnd()
public int	handlerTableSize()
public Address	immutableDataBegin()
public Address	immutableDataEnd()
public Address	immutableDataRefCountBegin()
public int	immutableDataSize()
private static void	initialize(TypeDataBase db) Hides sun.jvm.hotspot.code.CodeBlob.initialize.
public Address	instsBegin()
public boolean	instsContains(Address addr)
public Address	instsEnd()
public int	instsSize()
public boolean	isDeoptEntry(Address pc)
public boolean	isDeoptPc(Address pc)
public boolean	isJavaMethod() Overrides sun.jvm.hotspot.code.CodeBlob.isJavaMethod.
public boolean	isNativeMethod() Overrides sun.jvm.hotspot.code.CodeBlob.isNativeMethod.
public boolean	isOSRMethod()
pack-priv static boolean	match_desc(PCDesc pc, int pc_offset, boolean approximate)
public Address	metadataBegin()
public boolean	metadataContains(Address addr)
public Address	metadataEnd()
public int	metadataSize()
public Address	nulChkTableBegin()
public boolean	nulChkTableContains(Address addr)
public Address	nulChkTableEnd()
public int	nulChkTableSize()
public Address	oopsBegin()
public boolean	oopsContains(Address addr)
public Address	oopsEnd()
public int	oopsSize()
public int	origPCOffset()
pack-priv PCDesc	pc_desc_at(long pc)
pack-priv PCDesc	pc_desc_near(long pc)
public void	print() Overrides sun.jvm.hotspot.code.CodeBlob.print.
protected void	printComponentsOn(PrintStream tty) Overrides sun.jvm.hotspot.code.CodeBlob.printComponentsOn.
public ScopeDesc	scope_desc_in(long begin, long end)
public Address	scopesDataBegin()
public boolean	scopesDataContains(Address addr)
public Address	scopesDataEnd()
public int	scopesDataSize()
public Address	scopesPCsBegin()
public boolean	scopesPCsContains(Address addr)
public Address	scopesPCsEnd()
public int	scopesPCsSize()
public Address	stubBegin()
public boolean	stubContains(Address addr)
public Address	stubEnd()
public int	stubSize()
public String	toString() Overrides sun.jvm.hotspot.runtime.VMObject.toString. Returns a string representation of the object.
public int	totalSize()

Field Detail

compLevelField	back to summary
private static CIntField compLevelField

deoptHandlerEntryOffsetField	back to summary
private static CIntegerField deoptHandlerEntryOffsetField

entryBCIField	back to summary
private static CIntegerField entryBCIField != InvocationEntryBci if this nmethod is an on-stack replacement method

entryOffsetField	back to summary
private static CIntField entryOffsetField Entry point with class check

exceptionOffsetField	back to summary
private static CIntegerField exceptionOffsetField Offsets for different nmethod parts

handlerTableOffsetField	back to summary
private static CIntField handlerTableOffsetField

immutableDataField	back to summary
private static AddressField immutableDataField

immutableDataRefCountOffsetField	back to summary
private static CIntegerField immutableDataRefCountOffsetField

immutableDataRefCountSize	back to summary
private static long immutableDataRefCountSize

immutableDataSizeField	back to summary
private static CIntegerField immutableDataSizeField

methodField	back to summary
private static AddressField methodField

nulChkTableOffsetField	back to summary
private static CIntField nulChkTableOffsetField

origPCOffsetField	back to summary
private static CIntegerField origPCOffsetField

osrEntryPointField	back to summary
private static AddressField osrEntryPointField Entry point for on stack replacement

osrLinkField	back to summary
private static AddressField osrLinkField To support simple linked-list chaining of nmethods

pcDescSize	back to summary
private static long pcDescSize

scopesDataOffsetField	back to summary
private static CIntegerField scopesDataOffsetField

scopesPCsOffsetField	back to summary
private static CIntegerField scopesPCsOffsetField

stubOffsetField	back to summary
private static CIntegerField stubOffsetField

verifiedEntryOffsetField	back to summary
private static CIntField verifiedEntryOffsetField Entry point without class check

Constructor Detail

NMethod	back to summary
public NMethod(Address addr)

Method Detail

canBeDeoptimized	back to summary
public boolean canBeDeoptimized() Tells whether frames described by this nmethod can be deoptimized. Note native wrappers cannot be deoptimized.

constantsBegin	back to summary
public Address constantsBegin() Boundaries for different parts

constantsContains	back to summary
public boolean constantsContains(Address addr)

constantsEnd	back to summary
public Address constantsEnd()

constantsSize	back to summary
public int constantsSize()

decodeAllScopeDescs	back to summary
public void decodeAllScopeDescs() Attempt to decode all the debug info in this nmethod. This is intended purely for testing.

deoptHandlerEntry	back to summary
public Address deoptHandlerEntry()

dependenciesBegin	back to summary
public Address dependenciesBegin()

dependenciesEnd	back to summary
public Address dependenciesEnd()

dependenciesSize	back to summary
public int dependenciesSize()

exceptionBegin	back to summary
public Address exceptionBegin()

find_pc_desc	back to summary
pack-priv PCDesc find_pc_desc(long pc, boolean approximate)

find_pc_desc_internal	back to summary
pack-priv PCDesc find_pc_desc_internal(long pc, boolean approximate)

flagsToString	back to summary
public String flagsToString()

getAddress	back to summary
public Address getAddress() Overrides sun.jvm.hotspot.runtime.VMObject.getAddress.

getCompLevel	back to summary
private int getCompLevel()

getDeoptHandlerEntryOffset	back to summary
private int getDeoptHandlerEntryOffset()

getEntryBCI	back to summary
private int getEntryBCI()

getEntryBCIOffset	back to summary
public static int getEntryBCIOffset()

getEntryPoint	back to summary
public Address getEntryPoint() Entry points

getEntryPointOffset	back to summary
public int getEntryPointOffset() Support for code generation. Only here for proof-of-concept.

getExceptionOffset	back to summary
private int getExceptionOffset()

getHandlerTableOffset	back to summary
private int getHandlerTableOffset()

getImmutableDataRefCountOffset	back to summary
private int getImmutableDataRefCountOffset()

getImmutableDataSize	back to summary
public int getImmutableDataSize()

getMetadataAt	back to summary
public Address getMetadataAt(int index) Support for metadata in scopes and relocs. Note index 0 is reserved for null.

getMetadataLength	back to summary
public int getMetadataLength()

getMethod	back to summary
public Method getMethod()

getMethodAt	back to summary
public Method getMethodAt(int index)

getMethodOffset	back to summary
public static int getMethodOffset()

getName	back to summary
public String getName() Overrides sun.jvm.hotspot.code.CodeBlob.getName.

getNulChkTableOffset	back to summary
private int getNulChkTableOffset()

getOopAt	back to summary
public OopHandle getOopAt(int index) Support for oops in scopes and relocs. Note index 0 is reserved for null.

getOopsLength	back to summary
public int getOopsLength()

getOSREntryBCI	back to summary
public int getOSREntryBCI() On-stack replacement support

getOSREntryPointOffset	back to summary
public static int getOSREntryPointOffset()

getOSRLink	back to summary
public NMethod getOSRLink()

getPCDescAt	back to summary
public PCDesc getPCDescAt(Address pc) Finds a PCDesc with real-pc equal to "pc"

getPCDescNearDbg	back to summary
public PCDesc getPCDescNearDbg(Address pc) This is only for use by the debugging system, and is only intended for use in the topmost frame, where we are not guaranteed to be at a PC for which we have a PCDesc. It finds the PCDesc with realPC closest to the current PC that has a valid scope decode offset.

getSafepoints	back to summary
public Map<Address, PCDesc> getSafepoints()

getScopeDescAt	back to summary
public ScopeDesc getScopeDescAt(Address pc) ScopeDesc for an instruction

getScopeDescNearDbg	back to summary
public ScopeDesc getScopeDescNearDbg(Address pc) This is only for use by the debugging system, and is only intended for use in the topmost frame, where we are not guaranteed to be at a PC for which we have a PCDesc. It finds the ScopeDesc closest to the current PC. NOTE that this may return NULL for compiled methods which don't have any ScopeDescs!

getScopesDataOffset	back to summary
private int getScopesDataOffset()

getScopesPCsOffset	back to summary
private int getScopesPCsOffset()

getStubOffset	back to summary
private int getStubOffset()

getVerifiedEntryPoint	back to summary
public Address getVerifiedEntryPoint()

getVerifiedEntryPointOffset	back to summary
public int getVerifiedEntryPointOffset()

handlerTableBegin	back to summary
public Address handlerTableBegin()

handlerTableContains	back to summary
public boolean handlerTableContains(Address addr)

handlerTableEnd	back to summary
public Address handlerTableEnd()

handlerTableSize	back to summary
public int handlerTableSize()

immutableDataBegin	back to summary
public Address immutableDataBegin()

immutableDataEnd	back to summary
public Address immutableDataEnd()

immutableDataRefCountBegin	back to summary
public Address immutableDataRefCountBegin()

immutableDataSize	back to summary
public int immutableDataSize()

initialize	back to summary
private static void initialize(TypeDataBase db) Hides sun.jvm.hotspot.code.CodeBlob.initialize.

instsBegin	back to summary
public Address instsBegin()

instsContains	back to summary
public boolean instsContains(Address addr)

instsEnd	back to summary
public Address instsEnd()

instsSize	back to summary
public int instsSize()

isDeoptEntry	back to summary
public boolean isDeoptEntry(Address pc)

isDeoptPc	back to summary
public boolean isDeoptPc(Address pc)

isJavaMethod	back to summary
public boolean isJavaMethod() Overrides sun.jvm.hotspot.code.CodeBlob.isJavaMethod.

isNativeMethod	back to summary
public boolean isNativeMethod() Overrides sun.jvm.hotspot.code.CodeBlob.isNativeMethod.

isOSRMethod	back to summary
public boolean isOSRMethod()

match_desc	back to summary
pack-priv static boolean match_desc(PCDesc pc, int pc_offset, boolean approximate)

metadataBegin	back to summary
public Address metadataBegin()

metadataContains	back to summary
public boolean metadataContains(Address addr)

metadataEnd	back to summary
public Address metadataEnd()

metadataSize	back to summary
public int metadataSize()

nulChkTableBegin	back to summary
public Address nulChkTableBegin()

nulChkTableContains	back to summary
public boolean nulChkTableContains(Address addr)

nulChkTableEnd	back to summary
public Address nulChkTableEnd()

nulChkTableSize	back to summary
public int nulChkTableSize()

oopsBegin	back to summary
public Address oopsBegin()

oopsContains	back to summary
public boolean oopsContains(Address addr)

oopsEnd	back to summary
public Address oopsEnd()

oopsSize	back to summary
public int oopsSize()

origPCOffset	back to summary
public int origPCOffset()

pc_desc_at	back to summary
pack-priv PCDesc pc_desc_at(long pc)

pc_desc_near	back to summary
pack-priv PCDesc pc_desc_near(long pc)

print	back to summary
public void print() Overrides sun.jvm.hotspot.code.CodeBlob.print.

printComponentsOn	back to summary
protected void printComponentsOn(PrintStream tty) Overrides sun.jvm.hotspot.code.CodeBlob.printComponentsOn.

scope_desc_in	back to summary
public ScopeDesc scope_desc_in(long begin, long end)

scopesDataBegin	back to summary
public Address scopesDataBegin()

scopesDataContains	back to summary
public boolean scopesDataContains(Address addr)

scopesDataEnd	back to summary
public Address scopesDataEnd()

scopesDataSize	back to summary
public int scopesDataSize()

scopesPCsBegin	back to summary
public Address scopesPCsBegin()

scopesPCsContains	back to summary
public boolean scopesPCsContains(Address addr)

scopesPCsEnd	back to summary
public Address scopesPCsEnd()

scopesPCsSize	back to summary
public int scopesPCsSize()

stubBegin	back to summary
public Address stubBegin()

stubContains	back to summary
public boolean stubContains(Address addr)

stubEnd	back to summary
public Address stubEnd()

stubSize	back to summary
public int stubSize()

toString back to summary

public String toString()

Overrides sun.jvm.hotspot.runtime.VMObject.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

totalSize	back to summary
public int totalSize()

public Class NMethod

Field Summary

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Method Summary

Field Detail

Constructor Detail

Method Detail