jdk.internal.jvmci.code

Class RegisterAttributes

java.lang.Object

jdk.internal.jvmci.code.RegisterAttributes

public class RegisterAttributes
extends Object

A collection of register attributes. The specific attribute values for a register may be local to a compilation context. For example, a RegisterConfig in use during a compilation will determine which registers are callee saved.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	allocatable
private boolean	calleeSave
private boolean	callerSave
static RegisterAttributes	NONE

Constructor Summary

Constructors

Constructor and Description
RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable)

Method Summary

Modifier and Type	Method and Description
static RegisterAttributes[]	createMap(RegisterConfig registerConfig, Register[] registers) Creates a map from register numbers to register attributes for a given register configuration and set of registers.
boolean	isAllocatable()
boolean	isCalleeSave()
boolean	isCallerSave()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

callerSave

private final boolean callerSave

calleeSave

private final boolean calleeSave

allocatable

private final boolean allocatable

NONE

public static final RegisterAttributes NONE

Constructor Detail

RegisterAttributes

public RegisterAttributes(boolean isCallerSave,
                          boolean isCalleeSave,
                          boolean isAllocatable)

Method Detail

createMap

public static RegisterAttributes[] createMap(RegisterConfig registerConfig,
                                             Register[] registers)

Creates a map from register numbers to register attributes for a given register configuration and set of registers.

Parameters:

registerConfig - a register configuration

registers - a set of registers

Returns:

an array whose length is the max register number in registers plus 1. An element at index i holds the attributes of the register whose number is i.

isAllocatable

public boolean isAllocatable()

Returns:

Denotes a register that is available for use by a register allocator.

isCalleeSave

public boolean isCalleeSave()

Returns:

Denotes a register whose value preservation (if required) across a call is the responsibility of the callee.

isCallerSave

public boolean isCallerSave()

Returns:

Denotes a register whose value preservation (if required) across a call is the responsibility of the caller.