jdk.internal.jvmci.hotspot

Class HotSpotMemoryAccessProviderImpl

java.lang.Object

jdk.internal.jvmci.hotspot.HotSpotMemoryAccessProviderImpl

All Implemented Interfaces:

HotSpotMemoryAccessProvider, HotSpotProxified, MemoryAccessProvider

public class HotSpotMemoryAccessProviderImpl
extends Object
implements HotSpotMemoryAccessProvider, HotSpotProxified

HotSpot implementation of MemoryAccessProvider.

Field Summary

Fields

Modifier and Type	Field and Description
protected HotSpotJVMCIRuntimeProvider	runtime

Constructor Summary

Constructors

Constructor and Description
HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime)

Method Summary

Modifier and Type	Method and Description
private static Object	asObject(Constant base)
private static long	asRawPointer(Constant base)
private boolean	isValidObjectFieldDisplacement(Constant base, long displacement)
Constant	readKlassPointerConstant(Constant base, long displacement)
Constant	readMethodPointerConstant(Constant base, long displacement)
Constant	readNarrowKlassPointerConstant(Constant base, long displacement, HotSpotVMConfig.CompressEncoding encoding)
JavaConstant	readNarrowOopConstant(Constant base, long displacement, HotSpotVMConfig.CompressEncoding encoding)
JavaConstant	readObjectConstant(Constant base, long displacement) Reads a Java Object value using a base address and a displacement.
JavaConstant	readPrimitiveConstant(Kind kind, Constant baseConstant, long initialDisplacement, int bits) Reads a primitive value using a base address and a displacement.
private Object	readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed)
private static long	readRawValue(Constant baseConstant, long displacement, int bits)
JavaConstant	readUnsafeConstant(Kind kind, JavaConstant baseConstant, long displacement) Reads a value of this kind using a base address and a displacement.
private boolean	verifyReadRawObject(Object expected, Constant base, long displacement, boolean compressed)

Methods inherited from class java.lang.Object

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

Field Detail

runtime

protected final HotSpotJVMCIRuntimeProvider runtime

Constructor Detail

HotSpotMemoryAccessProviderImpl

public HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime)

Method Detail

asObject

private static Object asObject(Constant base)

isValidObjectFieldDisplacement

private boolean isValidObjectFieldDisplacement(Constant base,
                                               long displacement)

asRawPointer

private static long asRawPointer(Constant base)

readRawValue

private static long readRawValue(Constant baseConstant,
                                 long displacement,
                                 int bits)

verifyReadRawObject

private boolean verifyReadRawObject(Object expected,
                                    Constant base,
                                    long displacement,
                                    boolean compressed)

readRawObject

private Object readRawObject(Constant baseConstant,
                             long initialDisplacement,
                             boolean compressed)

readUnsafeConstant

public JavaConstant readUnsafeConstant(Kind kind,
                                       JavaConstant baseConstant,
                                       long displacement)

Description copied from interface: MemoryAccessProvider

Reads a value of this kind using a base address and a displacement. No bounds checking or type checking is performed. Returns null if the value is not available at this point.

Specified by:

readUnsafeConstant in interface MemoryAccessProvider

baseConstant - the base address from which the value is read.

displacement - the displacement within the object in bytes

Returns:

the read value encapsulated in a JavaConstant object, or null if the value cannot be read.

readPrimitiveConstant

public JavaConstant readPrimitiveConstant(Kind kind,
                                          Constant baseConstant,
                                          long initialDisplacement,
                                          int bits)

Description copied from interface: MemoryAccessProvider

Reads a primitive value using a base address and a displacement.

Specified by:

readPrimitiveConstant in interface MemoryAccessProvider

Parameters:

kind - the Kind of the returned JavaConstant object

baseConstant - the base address from which the value is read

initialDisplacement - the displacement within the object in bytes

bits - the number of bits to read from memory

Returns:

the read value encapsulated in a JavaConstant object of Kind kind

readObjectConstant

public JavaConstant readObjectConstant(Constant base,
                                       long displacement)

Description copied from interface: MemoryAccessProvider

Reads a Java Object value using a base address and a displacement.

Specified by:

readObjectConstant in interface MemoryAccessProvider

Parameters:

base - the base address from which the value is read

displacement - the displacement within the object in bytes

Returns:

the read value encapsulated in a Constant object

readNarrowOopConstant

public JavaConstant readNarrowOopConstant(Constant base,
                                          long displacement,
                                          HotSpotVMConfig.CompressEncoding encoding)

Specified by:

readNarrowOopConstant in interface HotSpotMemoryAccessProvider

readKlassPointerConstant

public Constant readKlassPointerConstant(Constant base,
                                         long displacement)

Specified by:

readKlassPointerConstant in interface HotSpotMemoryAccessProvider

readNarrowKlassPointerConstant

public Constant readNarrowKlassPointerConstant(Constant base,
                                               long displacement,
                                               HotSpotVMConfig.CompressEncoding encoding)

Specified by:

readNarrowKlassPointerConstant in interface HotSpotMemoryAccessProvider

readMethodPointerConstant

public Constant readMethodPointerConstant(Constant base,
                                          long displacement)

Specified by:

readMethodPointerConstant in interface HotSpotMemoryAccessProvider