harpoon.Backend.Generic
Class GCInfo.GCPoint

java.lang.Object
  harpoon.Backend.Generic.GCInfo.GCPoint

Enclosing class:

GCInfo

public static class GCInfo.GCPoint
extends Object

A GCPoint contains information about all the live objects that the garbage collector needs to add to the root set at a particular GC point.

Field Summary

protected Map	calleeSaved
protected Instr	gcPoint
protected Label	label
protected Set	liveMachineRegLocs
protected Set	liveStackOffsetLocs
protected Map	regDerivations
protected Map	stackDerivations

Constructor Summary

GCInfo.GCPoint(Instr gcPoint, Label label, Map liveDerivations, Set locations, Map calleeSaved)
Creates a GCPoint object

Method Summary

Map	calleeSaved() Returns an unmodifiable Map of callee-saved BackendDerivation.Registers to the CommonLocs where its contents has been stored
Label	label() Returns the Label identifying the GC point
Set	liveMachineRegLocs() Returns an unmodifiable Set of live, non-derived pointers at this GC point as WrappedMachineRegLocs
Set	liveStackOffsetLocs() Returns an unmodifiable Set of live, non-derived pointers at this GC point as WrappedStackOffsetLocs
Map	regDerivations() Returns an unmodifiable Map of live derived pointers in WrappedMachineRegLocs to the derivation information in the form of DLocs for that GC point
Map	stackDerivations() Returns an unmodifiable Map of live derived pointers in StackOffsetLocs to the derivation information in the form of DLocs for that GC point

Methods inherited from class java.lang.Object

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

Field Detail

gcPoint

protected Instr gcPoint

label

protected Label label

regDerivations

protected Map regDerivations

stackDerivations

protected Map stackDerivations

liveStackOffsetLocs

protected Set liveStackOffsetLocs

liveMachineRegLocs

protected Set liveMachineRegLocs

calleeSaved

protected Map calleeSaved

Constructor Detail

GCInfo.GCPoint

public GCInfo.GCPoint(Instr gcPoint,
                      Label label,
                      Map liveDerivations,
                      Set locations,
                      Map calleeSaved)

Creates a GCPoint object

Parameters:

label - the Label identifying the gcPoint

liveDerivations - a Map of pointer locations as Sets of CommonLocs to the corresponding derivation information as DLocs

locations - a Set of CommonLocs that represent live pointers at the given GC point

calleeSaved - a Map of the callee-saved BackendDerivation.Registers to the WrappedStackOffsetLocs where its contents has been stored

Method Detail

label

public Label label()

Returns the Label identifying the GC point

regDerivations

public Map regDerivations()

Returns an unmodifiable Map of live derived pointers in WrappedMachineRegLocs to the derivation information in the form of DLocs for that GC point

stackDerivations

public Map stackDerivations()

Returns an unmodifiable Map of live derived pointers in StackOffsetLocs to the derivation information in the form of DLocs for that GC point

liveStackOffsetLocs

public Set liveStackOffsetLocs()

Returns an unmodifiable Set of live, non-derived pointers at this GC point as WrappedStackOffsetLocs

liveMachineRegLocs

public Set liveMachineRegLocs()

Returns an unmodifiable Set of live, non-derived pointers at this GC point as WrappedMachineRegLocs

calleeSaved

public Map calleeSaved()

Returns an unmodifiable Map of callee-saved BackendDerivation.Registers to the CommonLocs where its contents has been stored