Interval

java.lang.Object
- org.graalvm.compiler.lir.alloc.lsra.Interval

```
public final class Interval
extends Object
```
Represents an interval in the linear scan register allocator.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`Interval.RegisterPriority` Constants denoting the register usage priority for an interval.
`static class`	`Interval.SpillState` Constants used in optimization of spilling of an interval.
`static class`	`Interval.UsePosList` List of use positions.

Field Summary

Fields
Modifier and Type	Field and Description
`protected static int`	`END_MARKER_OPERAND_NUMBER`
`AllocatableValue`	`operand` The register or variable for this interval prior to register allocation.
`int`	`operandNumber` The operand number for this interval's operand.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addMaterializationValue(Constant value)` Sets the value which is used for re-materialization.
`void`	`addRange(int from, int to)`
`void`	`addUsePos(int pos, Interval.RegisterPriority registerPriority, boolean detailedAsserts)`
`boolean`	`alwaysInMemory()`
`boolean`	`canMaterialize()` Returns true if this interval can be re-materialized when spilled.
`Range`	`first()`
`int`	`from()`
`Constant`	`getMaterializedValue()` Returns a value which can be moved to a register instead of a restore-move from stack.
`boolean`	`isEndMarker()` Returns true is this is the sentinel interval that denotes the end of an interval list.
`boolean`	`isSplitParent()`
`<any>`	`kind()`
`AllocatableValue`	`location()` Gets the register or spill slot assigned to this interval.
`Interval`	`locationHint(boolean searchSplitChild)`
`String`	`logString(LinearScan allocator)` Gets a single line string for logging the details of this interval to a log stream.
`void`	`setKind(<any> kind)`
`void`	`setLocationHint(Interval interval)`
`void`	`setSpillDefinitionPos(int pos)`
`void`	`setSpillSlot(AllocatableValue slot)`
`void`	`setSpillState(Interval.SpillState state)`
`int`	`spillDefinitionPos()`
`AllocatableValue`	`spillSlot()` Gets the canonical spill slot for this interval.
`Interval.SpillState`	`spillState()`
`Interval`	`splitParent()` Gets the split parent for this interval.
`String`	`toString()`
`Interval.UsePosList`	`usePosList()` Gets the use position information for this interval.

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - END_MARKER_OPERAND_NUMBER
```
protected static final int END_MARKER_OPERAND_NUMBER
```
    See Also:
    
    Constant Field Values
  - operand
```
public final AllocatableValue operand
```
    The register or variable for this interval prior to register allocation.
  - operandNumber
```
public final int operandNumber
```
    The operand number for this interval's operand.
- Method Detail
  - isEndMarker
```
public boolean isEndMarker()
```
    Returns true is this is the sentinel interval that denotes the end of an interval list.
  - location
```
public AllocatableValue location()
```
    Gets the register or spill slot assigned to this interval.
  - kind
```
public <any> kind()
```
  - setKind
```
public void setKind(<any> kind)
```
  - first
```
public Range first()
```
  - from
```
public int from()
```
  - setLocationHint
```
public void setLocationHint(Interval interval)
```
  - isSplitParent
```
public boolean isSplitParent()
```
  - splitParent
```
public Interval splitParent()
```
    Gets the split parent for this interval.
  - spillSlot
```
public AllocatableValue spillSlot()
```
    Gets the canonical spill slot for this interval.
  - setSpillSlot
```
public void setSpillSlot(AllocatableValue slot)
```
  - spillState
```
public Interval.SpillState spillState()
```
  - spillDefinitionPos
```
public int spillDefinitionPos()
```
  - setSpillState
```
public void setSpillState(Interval.SpillState state)
```
  - setSpillDefinitionPos
```
public void setSpillDefinitionPos(int pos)
```
  - alwaysInMemory
```
public boolean alwaysInMemory()
```
  - addMaterializationValue
```
public void addMaterializationValue(Constant value)
```
    Sets the value which is used for re-materialization.
  - canMaterialize
```
public boolean canMaterialize()
```
    Returns true if this interval can be re-materialized when spilled. This means that no spill-moves are needed. Instead of restore-moves the Interval.materializedValue is restored.
  - getMaterializedValue
```
public Constant getMaterializedValue()
```
    Returns a value which can be moved to a register instead of a restore-move from stack.
  - locationHint
```
public Interval locationHint(boolean searchSplitChild)
```
  - addUsePos
```
public void addUsePos(int pos,
                      Interval.RegisterPriority registerPriority,
                      boolean detailedAsserts)
```
  - addRange
```
public void addRange(int from,
                     int to)
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - usePosList
```
public Interval.UsePosList usePosList()
```
    Gets the use position information for this interval.
  - logString
```
public String logString(LinearScan allocator)
```
    Gets a single line string for logging the details of this interval to a log stream.
    
    Parameters:
    
    allocator - the register allocator context

Class Interval

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

END_MARKER_OPERAND_NUMBER

operand

operandNumber

Method Detail

isEndMarker

location

kind

setKind

first

from

setLocationHint

isSplitParent

splitParent

spillSlot

setSpillSlot

spillState

spillDefinitionPos

setSpillState

setSpillDefinitionPos

alwaysInMemory

addMaterializationValue

canMaterialize

getMaterializedValue

locationHint

addUsePos

addRange

toString

usePosList

logString