jdk.internal.jvmci.hotspot

Class HotSpotNmethod

java.lang.Object

jdk.internal.jvmci.code.InstalledCode

jdk.internal.jvmci.hotspot.HotSpotInstalledCode

jdk.internal.jvmci.hotspot.HotSpotNmethod

public class HotSpotNmethod
extends HotSpotInstalledCode

Implementation of InstalledCode for code installed as an nmethod. The nmethod stores a weak reference to an instance of this class. This is necessary to keep the nmethod from being unloaded while the associated HotSpotNmethod instance is alive.

Note that there is no (current) way for the reference from an nmethod to a HotSpotNmethod instance to be anything but weak. This is due to the fact that HotSpot does not treat nmethods as strong GC roots.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	isDefault
private boolean	isExternal
private HotSpotResolvedJavaMethod	method This (indirect) Method* reference is safe since class redefinition preserves all methods associated with nmethods in the code cache.

Fields inherited from class jdk.internal.jvmci.code.InstalledCode

name

Constructor Summary

Constructors

Constructor and Description
HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault)
HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault, boolean isExternal)

Method Summary

Modifier and Type	Method and Description
private boolean	checkArgs(Object... args)
protected boolean	checkThreeObjectArgs()
Object	executeVarargs(Object... args) Executes the installed code with a variable number of arguments.
ResolvedJavaMethod	getMethod()
long	getStart() Returns the start address of this installed code if it is valid, 0 otherwise.
void	invalidate() Invalidates this installed code such that any subsequent invocation will throw an InvalidInstalledCodeException.
boolean	isDefault()
boolean	isExternal()
String	toString()

Methods inherited from class jdk.internal.jvmci.hotspot.HotSpotInstalledCode

getBlob, getCode, getCodeSize, getSize

Methods inherited from class jdk.internal.jvmci.code.InstalledCode

getAddress, getName, getVersion, isValid, setAddress

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

method

private final HotSpotResolvedJavaMethod method

This (indirect) Method* reference is safe since class redefinition preserves all methods associated with nmethods in the code cache.

isDefault

private final boolean isDefault

isExternal

private final boolean isExternal

Constructor Detail

HotSpotNmethod

public HotSpotNmethod(HotSpotResolvedJavaMethod method,
                      String name,
                      boolean isDefault)

HotSpotNmethod

public HotSpotNmethod(HotSpotResolvedJavaMethod method,
                      String name,
                      boolean isDefault,
                      boolean isExternal)

Method Detail

isDefault

public boolean isDefault()

isExternal

public boolean isExternal()

getMethod

public ResolvedJavaMethod getMethod()

invalidate

public void invalidate()

Description copied from class: InstalledCode

Invalidates this installed code such that any subsequent invocation will throw an InvalidInstalledCodeException.

Overrides:

invalidate in class InstalledCode

toString

public String toString()

Specified by:

toString in class HotSpotInstalledCode

checkThreeObjectArgs

protected boolean checkThreeObjectArgs()

checkArgs

private boolean checkArgs(Object... args)

executeVarargs

public Object executeVarargs(Object... args)
                      throws InvalidInstalledCodeException

Description copied from class: InstalledCode

Executes the installed code with a variable number of arguments.

Overrides:

executeVarargs in class InstalledCode

Parameters:

args - the array of object arguments

Returns:

the value returned by the executed code

Throws:

InvalidInstalledCodeException

getStart

public long getStart()

Description copied from class: InstalledCode

Returns the start address of this installed code if it is valid, 0 otherwise.

Overrides:

getStart in class HotSpotInstalledCode