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sun.jvm.hotspot.debugger

public Interface MachineDescription

Known Direct Implementers: sun.jvm.hotspot.debugger.MachineDescriptionAArch64, sun.jvm.hotspot.debugger.MachineDescriptionAMD64, sun.jvm.hotspot.debugger.MachineDescriptionPPC64, sun.jvm.hotspot.debugger.MachineDescriptionRISCV64
Imports: java.io.Serializable

Encapsulates machine-specific information that currently must be exported up to the Java level. Implementations must be serializable.

Method Summary

Modifier and Type	Method and Description
public long	cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) Returns the maximum value of the C integer type with the given size in bytes and signedness.
public long	cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) Returns the minimum value of the C integer type with the given size in bytes and signedness.
public long	getAddressSize() Returns the size of an address in bytes.
public boolean	isBigEndian() Indicates whether the CPU is big- or little-endian.
public boolean	isLP64() Indicates whether the underlying machine supports the LP64 data model.
public default boolean	supports32bitAlignmentOf64bitTypes() Indicates whether the underlying machine supports 64-bit types that are only 32-bit aligned.

Method Detail

cIntegerTypeMaxValue	back to summary
public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) Returns the maximum value of the C integer type with the given size in bytes and signedness. Throws IllegalArgumentException if the size in bytes is not legal for a C type (or can not be handled by this system). Note that the current implementation does not currently handle unsigned 8-byte longs properly.

cIntegerTypeMinValue	back to summary
public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) Returns the minimum value of the C integer type with the given size in bytes and signedness. Throws IllegalArgumentException if the size in bytes is not legal for a C type (or can not be handled by this system).

getAddressSize	back to summary
public long getAddressSize() Returns the size of an address in bytes. Currently needed to be able to traverse arrays of pointers or oops.

isBigEndian	back to summary
public boolean isBigEndian() Indicates whether the CPU is big- or little-endian. This information is typically only needed by the Debugger implementation.

isLP64	back to summary
public boolean isLP64() Indicates whether the underlying machine supports the LP64 data model.

supports32bitAlignmentOf64bitTypes	back to summary
public default boolean supports32bitAlignmentOf64bitTypes() Indicates whether the underlying machine supports 64-bit types that are only 32-bit aligned.