ImmixConstraints (Jikes RVM API)

Overview

Package

Class

Use

Tree

Deprecated

Index

Help

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

org.mmtk.plan.immix
Class ImmixConstraints

java.lang.Object
  org.mmtk.plan.PlanConstraints
      org.mmtk.plan.SimpleConstraints
          org.mmtk.plan.StopTheWorldConstraints
              org.mmtk.plan.immix.ImmixConstraints

Direct Known Subclasses:: StickyImmixConstraints

public class ImmixConstraints
extends StopTheWorldConstraints
extends StopTheWorldConstraints

This class and its subclasses communicate to the host VM/Runtime any features of the selected plan that it needs to know. This is separate from the main Plan/PlanLocal class in order to bypass any issues with ordering of static initialization.

Constructor Summary
`ImmixConstraints()`

Method Summary
`int`	`gcHeaderBits()`
`int`	`gcHeaderWords()`
`boolean`	`movesObjects()`
`int`	`numSpecializedScans()`
`boolean`	`requiresLOS()`

Methods inherited from class org.mmtk.plan.PlanConstraints
`generateGCTrace, generational, logSetBitMask, needsConcurrentWorkers, needsForwardAfterLiveness, needsLinearScan, needsLogBitInHeader, needsReadBarrier, needsReferenceTypeReadBarrier, needsStaticReadBarrier, needsStaticWriteBarrier, needsWriteBarrier, noParallelGC, unloggedBit, withGCspy`

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

Constructor Detail

ImmixConstraints

public ImmixConstraints()

Method Detail

gcHeaderBits

public int gcHeaderBits()

Specified by:: gcHeaderBits in class PlanConstraints

Returns:: The number of header bits that are required.

gcHeaderWords

public int gcHeaderWords()

Specified by:: gcHeaderWords in class PlanConstraints

Returns:: The number of header words that are required.

movesObjects

public boolean movesObjects()

Overrides:: movesObjects in class PlanConstraints

Returns:: True if this plan moves objects.

numSpecializedScans

public int numSpecializedScans()

Overrides:: numSpecializedScans in class PlanConstraints

Returns:: The specialized scan methods required

requiresLOS

public boolean requiresLOS()

Overrides:: requiresLOS in class PlanConstraints

Returns:: true because we cannot accommodate large objects in default allocator