org.jikesrvm.ia32

Enum RegisterConstants.GPR

java.lang.Object

java.lang.Enum<RegisterConstants.GPR>

org.jikesrvm.ia32.RegisterConstants.GPR

All Implemented Interfaces:

Serializable, Comparable<RegisterConstants.GPR>, MachineRegister, RegisterConstants.IntelMachineRegister

Enclosing class:

RegisterConstants

public static enum RegisterConstants.GPR
extends Enum<RegisterConstants.GPR>
implements RegisterConstants.IntelMachineRegister

Representation of general purpose registers

Enum Constant Summary

Enum Constants

Enum Constant and Description
EAX
EBP
EBX
ECX
EDI
EDX
EIP
ESI
ESP
R10
R11
R12
R13
R14
R15
R8
R9

Field Summary

Fields

Modifier and Type	Field and Description
private static RegisterConstants.GPR[]	vals Local copy of the backing array.

Method Summary

Modifier and Type	Method and Description
static RegisterConstants.GPR	getForOpcode(int opcode) Convert encoded value representing an opcode into the GPR to represent it
boolean	isValidAs8bitRegister() Intel have two flavours of 8bit opcodes, ones that operate on 32bit registers and ones that operate on 8bit registers.
static RegisterConstants.GPR	lookup(int num) Convert encoded value into the GPR it represents
boolean	needsREXprefix()
byte	value()
byte	valueForOpcode()
static RegisterConstants.GPR	valueOf(String name) Returns the enum constant of this type with the specified name.
static RegisterConstants.GPR[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EAX

public static final RegisterConstants.GPR EAX

ECX

public static final RegisterConstants.GPR ECX

EDX

public static final RegisterConstants.GPR EDX

EBX

public static final RegisterConstants.GPR EBX

ESP

public static final RegisterConstants.GPR ESP

EBP

public static final RegisterConstants.GPR EBP

ESI

public static final RegisterConstants.GPR ESI

EDI

public static final RegisterConstants.GPR EDI

R8

public static final RegisterConstants.GPR R8

R9

public static final RegisterConstants.GPR R9

R10

public static final RegisterConstants.GPR R10

R11

public static final RegisterConstants.GPR R11

R12

public static final RegisterConstants.GPR R12

R13

public static final RegisterConstants.GPR R13

R14

public static final RegisterConstants.GPR R14

R15

public static final RegisterConstants.GPR R15

EIP

public static final RegisterConstants.GPR EIP

Field Detail

vals

private static final RegisterConstants.GPR[] vals

Local copy of the backing array. Copied here to avoid calls to clone

Method Detail

values

public static RegisterConstants.GPR[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (RegisterConstants.GPR c : RegisterConstants.GPR.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static RegisterConstants.GPR valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

value

public byte value()

Specified by:

value in interface MachineRegister

Specified by:

value in interface RegisterConstants.IntelMachineRegister

Returns:

encoded value of this register

valueForOpcode

public byte valueForOpcode()

Returns:

encoded value of this register to be included in the opcode byte

needsREXprefix

public boolean needsREXprefix()

Specified by:

needsREXprefix in interface RegisterConstants.IntelMachineRegister

Returns:

does this register require a REX prefix byte?

isValidAs8bitRegister

public boolean isValidAs8bitRegister()

Intel have two flavours of 8bit opcodes, ones that operate on 32bit registers and ones that operate on 8bit registers. As the high half of 8bit registers doesn't allow ESI, EDI, EBP, ESP to be encoded, this routine returns true if this register is one of those unencodable registers.

Returns:

can this register be encoded as an 8byte register?

lookup

public static RegisterConstants.GPR lookup(int num)

Convert encoded value into the GPR it represents

Parameters:

num - encoded value

Returns:

represented GPR

getForOpcode

public static RegisterConstants.GPR getForOpcode(int opcode)

Convert encoded value representing an opcode into the GPR to represent it

Parameters:

opcode - encoded value

Returns:

represented GPR