com.oracle.svm.core

Class ReservedRegisters

java.lang.Object

com.oracle.svm.core.ReservedRegisters

Direct Known Subclasses:

AArch64ReservedRegisters, AMD64ReservedRegisters

public abstract class ReservedRegisters
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
protected jdk.vm.ci.code.Register	frameRegister
protected jdk.vm.ci.code.Register	heapBaseRegister
protected jdk.vm.ci.code.Register	threadRegister

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ReservedRegisters(jdk.vm.ci.code.Register frameRegister, jdk.vm.ci.code.Register threadRegisterCandidate, jdk.vm.ci.code.Register heapBaseRegisterCandidate)

Method Summary

Modifier and Type	Method and Description
jdk.vm.ci.code.Register	getFrameRegister() Returns the register used as the frame pointer.
jdk.vm.ci.code.Register	getHeapBaseRegister() Returns the register holding the heap base address for compressed pointers, i.e., the current Isolate; or null if no heap base register is used.
jdk.vm.ci.code.Register	getThreadRegister() Returns the register that contains the current IsolateThread; or null if no thread register is used.
boolean	isAllowedInFrameState(jdk.vm.ci.meta.JavaValue value) Returns true if the provided value is a RegisterValue for a reserved register that is allowed to be in a frame state, i.e., for a reserved register that can be handled by deoptimization.
static ReservedRegisters	singleton()

Methods inherited from class java.lang.Object

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

Field Detail

frameRegister

protected final jdk.vm.ci.code.Register frameRegister

threadRegister

protected final jdk.vm.ci.code.Register threadRegister

heapBaseRegister

protected final jdk.vm.ci.code.Register heapBaseRegister

Constructor Detail

ReservedRegisters

protected ReservedRegisters(jdk.vm.ci.code.Register frameRegister,
                            jdk.vm.ci.code.Register threadRegisterCandidate,
                            jdk.vm.ci.code.Register heapBaseRegisterCandidate)

Method Detail

singleton

public static ReservedRegisters singleton()

getFrameRegister

public jdk.vm.ci.code.Register getFrameRegister()

Returns the register used as the frame pointer.

getThreadRegister

public jdk.vm.ci.code.Register getThreadRegister()

Returns the register that contains the current IsolateThread; or null if no thread register is used.

getHeapBaseRegister

public jdk.vm.ci.code.Register getHeapBaseRegister()

Returns the register holding the heap base address for compressed pointers, i.e., the current Isolate; or null if no heap base register is used.

isAllowedInFrameState

public boolean isAllowedInFrameState(jdk.vm.ci.meta.JavaValue value)

Returns true if the provided value is a RegisterValue for a reserved register that is allowed to be in a frame state, i.e., for a reserved register that can be handled by deoptimization.