jdk.internal.jvmci.code

Class Register

java.lang.Object

jdk.internal.jvmci.code.Register

All Implemented Interfaces:

Comparable<Register>

public final class Register
extends Object
implements Comparable<Register>

Represents a target machine register.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Register.RegisterCategory A platform specific register type that describes which values can be stored in a register.

Field Summary

Fields

Modifier and Type	Field and Description
static Register	CallerFrame
int	encoding The actual encoding in a target machine instruction for this register, which may or may not be the same as number.
static Register	Frame Frame pointer of the current method.
String	name The mnemonic of this register.
static Register	None Invalid register.
int	number The identifier for this register that is unique across all the registers in a Architecture.
private Register.RegisterCategory	registerCategory A platform specific register category that describes which values can be stored in a register.
static Register.RegisterCategory	SPECIAL

Constructor Summary

Constructors

Constructor and Description
Register(int number, int encoding, String name, Register.RegisterCategory registerCategory) Creates a Register instance.

Method Summary

Modifier and Type	Method and Description
RegisterValue	asValue() Gets this register as a value with no particular kind.
RegisterValue	asValue(LIRKind kind) Gets this register as a value with a specified kind.
int	compareTo(Register o)
int	encoding() The assembler calls this method to get the register's encoding.
boolean	equals(Object obj)
int	getReferenceMapIndex() Get the start index of this register in the ReferenceMap.
Register.RegisterCategory	getRegisterCategory()
int	hashCode()
boolean	isValid() Determines if this is a valid register.
static int	maxRegisterEncoding(Register[] registers) Gets the maximum register encoding in a given set of registers.
static int	maxRegisterNumber(Register[] registers) Gets the maximum register number in a given set of registers.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SPECIAL

public static final Register.RegisterCategory SPECIAL

None

public static final Register None

Invalid register.

Frame

public static final Register Frame

Frame pointer of the current method. All spill slots and outgoing stack-based arguments are addressed relative to this register.

CallerFrame

public static final Register CallerFrame

number

public final int number

The identifier for this register that is unique across all the registers in a Architecture. A valid register has number > 0.

name

public final String name

The mnemonic of this register.

encoding

public final int encoding

The actual encoding in a target machine instruction for this register, which may or may not be the same as number.

registerCategory

private final Register.RegisterCategory registerCategory

A platform specific register category that describes which values can be stored in a register.

Constructor Detail

Register

public Register(int number,
                int encoding,
                String name,
                Register.RegisterCategory registerCategory)

Creates a Register instance.

Parameters:

number - unique identifier for the register

encoding - the target machine encoding for the register

name - the mnemonic name for the register

registerCategory - the register category

Method Detail

encoding

public int encoding()

The assembler calls this method to get the register's encoding.

getRegisterCategory

public Register.RegisterCategory getRegisterCategory()

getReferenceMapIndex

public int getReferenceMapIndex()

Get the start index of this register in the ReferenceMap.

asValue

public RegisterValue asValue(LIRKind kind)

Gets this register as a value with a specified kind.

Parameters:

kind - the specified kind

Returns:

the RegisterValue

asValue

public RegisterValue asValue()

Gets this register as a value with no particular kind.

Returns:

a RegisterValue with Kind.Illegal kind.

isValid

public boolean isValid()

Determines if this is a valid register.

Returns:

true iff this register is valid

maxRegisterNumber

public static int maxRegisterNumber(Register[] registers)

Gets the maximum register number in a given set of registers.

Parameters:

registers - the set of registers to process

Returns:

the maximum register number for any register in registers

maxRegisterEncoding

public static int maxRegisterEncoding(Register[] registers)

Gets the maximum register encoding in a given set of registers.

Parameters:

registers - the set of registers to process

Returns:

the maximum register encoding for any register in registers

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(Register o)

Specified by:

compareTo in interface Comparable<Register>

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object