com.oracle.graal.lir.alloc.lsra

Enum Interval.SpillState

java.lang.Object

java.lang.Enum<Interval.SpillState>

com.oracle.graal.lir.alloc.lsra.Interval.SpillState

All Implemented Interfaces:

Serializable, Comparable<Interval.SpillState>

Enclosing class:

Interval

public static enum Interval.SpillState
extends Enum<Interval.SpillState>

Constants used in optimization of spilling of an interval.

Enum Constant Summary

Enum Constants

Enum Constant and Description
NoDefinitionFound Starting state of calculation: no definition found yet.
NoOptimization The interval has more than one definition (e.g.
NoSpillStore One definition has already been found.
OneSpillStore One spill move has already been inserted.
SpillInDominator The interval is spilled multiple times or is spilled in a loop.
StartInMemory The interval starts in memory (e.g.
StoreAtDefinition The interval should be stored immediately after its definition to prevent multiple redundant stores.

Method Summary

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

NoDefinitionFound

public static final Interval.SpillState NoDefinitionFound

Starting state of calculation: no definition found yet.

NoSpillStore

public static final Interval.SpillState NoSpillStore

One definition has already been found. Two consecutive definitions are treated as one (e.g. a consecutive move and add because of two-operand LIR form). The position of this definition is given by Interval.spillDefinitionPos().

OneSpillStore

public static final Interval.SpillState OneSpillStore

One spill move has already been inserted.

SpillInDominator

public static final Interval.SpillState SpillInDominator

The interval is spilled multiple times or is spilled in a loop. Place the store somewhere on the dominator path between the definition and the usages.

StoreAtDefinition

public static final Interval.SpillState StoreAtDefinition

The interval should be stored immediately after its definition to prevent multiple redundant stores.

StartInMemory

public static final Interval.SpillState StartInMemory

The interval starts in memory (e.g. method parameter), so a store is never necessary.

NoOptimization

public static final Interval.SpillState NoOptimization

The interval has more than one definition (e.g. resulting from phi moves), so stores to memory are not optimized.

Method Detail

values

public static Interval.SpillState[] 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 (Interval.SpillState c : Interval.SpillState.values())
    System.out.println(c);

Returns:

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

valueOf

public static Interval.SpillState 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