org.graalvm.compiler.lir

Enum LIRInstruction.OperandMode

java.lang.Object

java.lang.Enum<LIRInstruction.OperandMode>

org.graalvm.compiler.lir.LIRInstruction.OperandMode

All Implemented Interfaces:

Serializable, Comparable<LIRInstruction.OperandMode>

Enclosing class:

LIRInstruction

public static enum LIRInstruction.OperandMode
extends Enum<LIRInstruction.OperandMode>

Constants denoting how a LIR instruction uses an operand.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALIVE The value must have been defined before.
DEF The value must not have been defined before.
TEMP The value must not have been defined before, and must not be used after the instruction.
USE The value must have been defined before.

Method Summary

Modifier and Type	Method and Description
static LIRInstruction.OperandMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static LIRInstruction.OperandMode[]	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

USE

public static final LIRInstruction.OperandMode USE

The value must have been defined before. It is alive before the instruction until the beginning of the instruction, but not necessarily throughout the instruction. A register assigned to it can also be assigned to a LIRInstruction.OperandMode.TEMP or LIRInstruction.OperandMode.DEF operand. The value can be used again after the instruction, so the instruction must not modify the register.

ALIVE

public static final LIRInstruction.OperandMode ALIVE

The value must have been defined before. It is alive before the instruction and throughout the instruction. A register assigned to it cannot be assigned to a LIRInstruction.OperandMode.TEMP or LIRInstruction.OperandMode.DEF operand. The value can be used again after the instruction, so the instruction must not modify the register.

TEMP

public static final LIRInstruction.OperandMode TEMP

The value must not have been defined before, and must not be used after the instruction. The instruction can do whatever it wants with the register assigned to it (or not use it at all).

DEF

public static final LIRInstruction.OperandMode DEF

The value must not have been defined before. The instruction has to assign a value to the register. The value can (and most likely will) be used after the instruction.

Method Detail

values

public static LIRInstruction.OperandMode[] values()

Returns:

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

valueOf

public static LIRInstruction.OperandMode valueOf(String name)

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