jdk.internal.jvmci.hotspot

Class HotSpotMetaAccessProvider

java.lang.Object

jdk.internal.jvmci.hotspot.HotSpotMetaAccessProvider

All Implemented Interfaces:

HotSpotProxified, MetaAccessProvider

public class HotSpotMetaAccessProvider
extends Object
implements MetaAccessProvider, HotSpotProxified

HotSpot implementation of MetaAccessProvider.

Field Summary

Fields

Modifier and Type	Field and Description
private Field	reflectionConstructorSlot Field object of Constructor.slot.
private Field	reflectionMethodSlot Field object of Method.slot.
protected HotSpotJVMCIRuntimeProvider	runtime

Constructor Summary

Constructors

Constructor and Description
HotSpotMetaAccessProvider(HotSpotJVMCIRuntimeProvider runtime)

Method Summary

Modifier and Type	Method and Description
static int	computeArrayAllocationSize(int length, int alignment, int headerSize, int log2ElementSize) Computes the size of the memory chunk allocated for an array.
int	convertDeoptAction(DeoptimizationAction action)
DeoptimizationAction	convertDeoptAction(int action)
int	convertDeoptReason(DeoptimizationReason reason)
DeoptimizationReason	convertDeoptReason(int reason)
int	decodeDebugId(JavaConstant constant)
DeoptimizationAction	decodeDeoptAction(JavaConstant constant)
DeoptimizationReason	decodeDeoptReason(JavaConstant constant)
JavaConstant	encodeDeoptActionAndReason(DeoptimizationAction action, DeoptimizationReason reason, int debugId) Encodes a deoptimization action and a deoptimization reason in an integer value.
long	getMemorySize(JavaConstant constant) Returns the number of bytes occupied by this constant value or constant object.
private static Field	getReflectionSlotField(Class<?> reflectionClass)
private static int	intMaskRight(int n)
ResolvedJavaField	lookupJavaField(Field reflectionField) Provides the ResolvedJavaField for a Field obtained via reflection.
ResolvedJavaMethod	lookupJavaMethod(Executable reflectionMethod) Provides the ResolvedJavaMethod for a Method or Constructor obtained via reflection.
ResolvedJavaType	lookupJavaType(Class<?> clazz) Returns the resolved Java type representing a given Java class.
HotSpotResolvedObjectType	lookupJavaType(JavaConstant constant) Returns the resolved Java type of the given JavaConstant object.
Signature	parseMethodDescriptor(String signature) Parses a method descriptor into a Signature.

Methods inherited from class java.lang.Object

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

Methods inherited from interface jdk.internal.jvmci.meta.MetaAccessProvider

lookupJavaTypes

Field Detail

runtime

protected final HotSpotJVMCIRuntimeProvider runtime

reflectionMethodSlot

private Field reflectionMethodSlot

Field object of Method.slot.

reflectionConstructorSlot

private Field reflectionConstructorSlot

Field object of Constructor.slot.

Constructor Detail

HotSpotMetaAccessProvider

public HotSpotMetaAccessProvider(HotSpotJVMCIRuntimeProvider runtime)

Method Detail

lookupJavaType

public ResolvedJavaType lookupJavaType(Class<?> clazz)

Description copied from interface: MetaAccessProvider

Returns the resolved Java type representing a given Java class.

Specified by:

lookupJavaType in interface MetaAccessProvider

Parameters:

clazz - the Java class object

Returns:

the resolved Java type object

lookupJavaType

public HotSpotResolvedObjectType lookupJavaType(JavaConstant constant)

Description copied from interface: MetaAccessProvider

Returns the resolved Java type of the given JavaConstant object.

Specified by:

lookupJavaType in interface MetaAccessProvider

Returns:

null if constant.isNull() || !constant.kind.isObject()

parseMethodDescriptor

public Signature parseMethodDescriptor(String signature)

Description copied from interface: MetaAccessProvider

Parses a method descriptor into a Signature. The behavior of this method is undefined if the method descriptor is not well formed.

Specified by:

parseMethodDescriptor in interface MetaAccessProvider

getReflectionSlotField

private static Field getReflectionSlotField(Class<?> reflectionClass)

lookupJavaMethod

public ResolvedJavaMethod lookupJavaMethod(Executable reflectionMethod)

Description copied from interface: MetaAccessProvider

Provides the ResolvedJavaMethod for a Method or Constructor obtained via reflection.

Specified by:

lookupJavaMethod in interface MetaAccessProvider

lookupJavaField

public ResolvedJavaField lookupJavaField(Field reflectionField)

Description copied from interface: MetaAccessProvider

Provides the ResolvedJavaField for a Field obtained via reflection.

Specified by:

lookupJavaField in interface MetaAccessProvider

intMaskRight

private static int intMaskRight(int n)

encodeDeoptActionAndReason

public JavaConstant encodeDeoptActionAndReason(DeoptimizationAction action,
                                               DeoptimizationReason reason,
                                               int debugId)

Description copied from interface: MetaAccessProvider

Encodes a deoptimization action and a deoptimization reason in an integer value.

Specified by:

encodeDeoptActionAndReason in interface MetaAccessProvider

debugId - an integer that can be used to track the origin of a deoptimization at runtime. There is no guarantee that the runtime will use this value. The runtime may even keep fewer than 32 bits.

Returns:

the encoded value as an integer

decodeDeoptReason

public DeoptimizationReason decodeDeoptReason(JavaConstant constant)

Specified by:

decodeDeoptReason in interface MetaAccessProvider

decodeDeoptAction

public DeoptimizationAction decodeDeoptAction(JavaConstant constant)

Specified by:

decodeDeoptAction in interface MetaAccessProvider

decodeDebugId

public int decodeDebugId(JavaConstant constant)

Specified by:

decodeDebugId in interface MetaAccessProvider

convertDeoptAction

public int convertDeoptAction(DeoptimizationAction action)

convertDeoptAction

public DeoptimizationAction convertDeoptAction(int action)

convertDeoptReason

public int convertDeoptReason(DeoptimizationReason reason)

convertDeoptReason

public DeoptimizationReason convertDeoptReason(int reason)

getMemorySize

public long getMemorySize(JavaConstant constant)

Description copied from interface: MetaAccessProvider

Returns the number of bytes occupied by this constant value or constant object.

Specified by:

getMemorySize in interface MetaAccessProvider

Parameters:

constant - the constant whose bytes should be measured

Returns:

the number of bytes occupied by this constant

computeArrayAllocationSize

public static int computeArrayAllocationSize(int length,
                                             int alignment,
                                             int headerSize,
                                             int log2ElementSize)

Computes the size of the memory chunk allocated for an array. This size accounts for the array header size, body size and any padding after the last element to satisfy object alignment requirements.

Parameters:

length - the number of elements in the array

alignment - the object alignment requirement

headerSize - the size of the array header

log2ElementSize - log2 of the size of an element in the array